Thursday, October 20, 2005

Driving 55 mph does save gas mileage

The old rule that driving no faster than 55 mph to save on gas still works. This guy tested a Chevy Malibu, and got an average of 35 mpg. However when he went bit over 70 mph, the mileage dropped sharply -- to 25 mpg.

For every mile per hour faster than 55 mph, fuel economy drops by about 1 percent, the drop-off increases at a greater rate after 65 mph. The faster you go, the faster the fuel goes.


There are costs the slower you go, however. It took 49 minutes longer to make the trip at 55 mph -- three hours and 36 minutes total -- but it seemed like forever. Sitting in the slow lane on the highway, tapping the gas pedal to maintain a steady speed of 55 makes the car felt like it was traveling at 25. Click here to read all about the 55 mph test.

*UPDATE* Only about 15% of the energy from the fuel you put in your tank gets used to move your car down the road or run useful accessories, such as air conditioning. The rest of the energy is lost to engine and driveline inefficiencies and idling. Therefore, the potential to improve fuel efficiency with advanced technologies is enormous. Read more here.

*UPDATE* I came across a tip that claims if you wash and wax your car, you can improve your gas mileage by up to 7%, which based on today's prices would be about $.21 per gallon. Not too shabby.The basic idea behind it is, after washing and waxing your car, the surface of the vehicle is much more likely to be nice and smooth, therefore, it should be more aerodynamic than when you have lots of bug guts smeared all over.

It looks like a sound theory, but I don't know if simply cleaning your car will increase your fuel economy that drastically. At the very least, your car's going to look nice? Source.

213 Comments:

At 11/28/2005 11:23 PM, Blogger Steve Hendry said...

I have a 2004 Corvette, at 55 MPH (I ran the test for 1 hour) I got 27 MPG. I then ran it at 75 MPH for the same amount of time, I got 28 MPG, hmmmm... why?

I then checked the RPM that my car was producing at each speed and the gearing. At 55 MPH, the transmission was in the same overdrive gear as at 75 MPH. Next I looked at the RPMs, I was at 1800 at 55 and 2100 at 75 MPH. This was the only major difference. I then looked at the power curve on my engine and saw that my main horsepower does not flatten until I hit around 2000 RPM, which is the constant power on my car.

I then looked at your Malibu and saw the curve. I would say that this is the reason that you are getting worse gas mileage at 75 vs 55. Your car is way, way underpowered. This is the same as in Europe. I have visited there dozens of times and was always amazed that I could rent an Audi A4 or Seat or whatever, and get 35 MPG at 120 KM = 75 MPH and why that was. The reason is that European cars are built for highway driving, their power curve is set as flat at higher RPMs, therefore they are more efficient at highway speeds - 110-130KM per hour, 65-80 MPH.

So, the problem again lies in auto manufacturers here - you need to get a car that is powered for the bulk that it is carrying and it has to be geared for highway speeds.

 
At 11/28/2005 11:41 PM, Blogger Johnny said...

I took a trip to Placerville, Ca. over this Thanksgiving weekend. We were driving a 96 Suburban 1500 2 WD. The trip distance was 450 miles. Due to traffic (not to much stop and go) we were only able to maintain speeds of about 65 to 70. When we filled up with gas on the way home, we had averaged 15.78 MPG. Now on the way home I drove subsatantially faster (above 80) for 95 % of the way home. We left at night, and there was little traffic. I have not had a chance to fill up yet, but I can tell you I got at least the same if not better mileage coming home.
I think a lot has to do with where the engines power curve is as well. At 65 MPH the engine RPM is below 2000, and I don't think that it is very efficient at that RPM. After all the Suburban is a tank.

 
At 11/29/2005 12:10 AM, Blogger Phantom said...

Well, I count in Kilometers. Yup, From way up North here in Canada but... I have to agree with Steve. Speed has Nothing to do with fuel consumption. It is your car that makes the difference.
I have a Ford Windstar 2000 with a 3.8. It is rated at 14 liters (3.698.. Gal)to 100 Klick(62.13712 miles) (16 mpg) in the city and 11 on highway.
I tested it over and over again (5 years worth) and the results are as follow.
If I keep constant speed of 70mph, I get as low as 9.5 liters to the 100 (2.5 gal per 62 miles) (or 24 mpg). At 60 miles per hour, I get 2.9 Gal to 62 miles.) So driving slow does not help. (I can even give you more numbers done with 18 wheelers (I drove them for 13 years) and you would be surprised.)
Although, I have to admit that if I "Step on it!" my mileage goes down the drain. Like crazy!
My suggestions (and I have 1.5 million miles to back me up on that) are as follow (take them or not, wont change much in my life but it may save you a buck or two… and the environment...)
1- Keep those tires properly inflated. (I usually keep them harder in the front (37 in the front and 34 in the back depending on the tire..)
2- Start slowly on that light. Stepping on it is fun but it drains that fuel. Let your engine do the work.
3- Once at speed, keep it constant. use that Cruise control as much as you can.
4- Don’t accelerate while going up a hill or bridge. Just keep it constant.
5- Use the other side of the hill (Gravity) to accelerate
6- Slow down before you get to that light or corner. Otherwise, you are just sending more energy to those breaks.
7- Don’t Idle too much.
8- Keep your engine and car in tune! Oil needs to be changed as well as spark plugs! I am even thinking that we should give an automatic ticket to those who break down on the road and cause traffic if they cannot prove that they had their car maintained recently.

All in all, every little bit helps but bottom line, adjust speed to your engine.and transmission. Don’t under rev and don’t over rev.

 
At 11/29/2005 12:18 AM, Blogger Phantom said...

Oh yeah,. One more thing in agreement to Johnny and Steve. I cannot believe that in 2005 we are still talking about 55mph and low fuel (should I say Car) efficiency.
This has to be the most ridiculous concept ever (right behind mornings and evenings traffic jams!)
No one will make me believe car manufacturers cannot make cars that go further on that gallon of fuel! (but that is an whole other conversation!)

 
At 11/29/2005 2:33 AM, Anonymous Anonymous said...

i drive a 69 cadilac with a 472ci
t400 trans and 2.11 gears. try working with all those varibles.
first i got a bigger air filter. mileage went down. then reset the timing to factory specs. huge increase in power and mileage. added trick shift. mileage went up. leaned out carb, mileage went down. turnedd it back. set mixture with merc guage. huge increase. greased wheel bearings, and new brakes. increased mileage. set caster and camber, biggest increase yet. i guess the point im trying to make is 14.0892 in the quarter, and 32 miles to the gallon on the highway. bone stock original. so why does a brand new toyota or honda etc. only get 20 something on the highway???

 
At 11/29/2005 4:39 AM, Anonymous engine ear said...

its me again. the 69 cadilac also has 40 psi in the front and 42 psi in the back. and they are les schwab 265/75/16 tires.
think of this
-------- 30 psi
----- 35 psi
-- 40 psi
thats how much rubber is touching the ground.
but at the track i run goodyear et street tires on the rear. with between 12 to 15 psi.

then i have this truck with a bored and stroked 454. it has a full engine management program. lots of gas, no matter how i set it up its 5 to 10 miles per gallon.
and turns a mid 16 in the quarter on motor only. and high 13 on gas.

did you know that a lean mixture will create more nox, a rich mixture will create more wasted fuel. nox is very bad for the enviroment. while raw fuel isnt good either. however raw fuel has the ability to contain and cool harmfull gasses, dropping them back to the ground. did you know that a catalytic converter increases the heat so much, that nox is increased a thousand times over a vehicle without one. did you know that without cooling towers on certain types of industrial buildings, we would all be dead from nox???

 
At 11/29/2005 10:25 AM, Anonymous Quintin said...

Not to sound like a conspiracy theorist, but car companies are paid by the fuel companies to build vehicles with a power curve like that. It does not harm the car or even alter the ride but it burns fuel like mad at certain speeds. When you look at the sticker on the car when you first buy it, it gives you and "estimate" as to what your car will get on the interstate and in the city with stop and go traffic. Those numbers are best case scenarios! I have a 94 Lincoln Mark 8 with a 4.6l V8 it still gets 25 mpg but it never got the 28 the sticker claimed when I first bought it in 94. There are ways to atomize fuel and make greater than 50-100 miles to a gallon but that would destroy our economy. We are a fuel burning world. Not only do the fuel companies prosper but average joe who owns 100 shares in shell relies on this as well. I think that we need to stop worrying so much on fuel prices. If we demand a cheaper price it will go down. It is simple stop buying gasoline when it goes up. car pool, take a bus, ride a bike, walk. There are a million methods. It is not always the Exxon or the Shel that is to blame. It is the Hodgies running the gas station that jacks up the price. This is america he has the right to do it. I would love to charge 200 dollars an hour for my work but no one hire me if I did, so lets tell the gas station owners that we will no "hire them" if we pay too much for gas.

 
At 11/29/2005 10:37 AM, Anonymous Anonymous said...

Johny---One thing you may not have considered about your trip is the change in elevation. I live in Florida, and driving up North may only change elevation 1000 feet or so, but I get way better mileage on the way back. That 1000 feet is actually doubled. On the way up the car works against it, on the way back it works with the car.

 
At 11/29/2005 10:42 AM, Anonymous Anonymous said...

My step-mother came up with an interesting view. There is all this talk about Hydrogen cars and Hybrids and what-not.....all great technologies to reduce gas consumption. She drives a 1980-85 (somewhere in there) Honda that STILL, 20 years later, gets 35 mpg. And her question is "What happen to that technology?" It didn't go away. We (Americans) just want to drive the biggest, baddest cars on the road.---Neilio42

 
At 11/29/2005 10:48 AM, Anonymous Anonymous said...

True you can get better gas mileage. But if your going faster you get home quicker and spend less time on the road eating gas. In all actuality you waste the same amount of energy going the same distance. Running as opposed to walking the same distance will burn the same amount of calories. Same as with a car. The only glitch is that if you slam on the gas and brake in stop and go traffic. All the energy is released as heat in the brakes. So that is a bad idea.

 
At 11/29/2005 10:50 AM, Anonymous Anonymous said...

That is a false statement

 
At 11/29/2005 10:58 AM, Anonymous Anonymous said...

Prove it false then.

 
At 11/29/2005 11:02 AM, Anonymous Skif Dank said...

A false statement indeed. Rather than going into some grand story about a trip or experience, planely stated: You get the best gas mileage in YOUR car by going the lowest speed you can keep while in your highest gear. Be it 45mph or 95mph, that's the rule and the ONLY true statement that can be made about EVERY car. Not even the old "keep your AC off" statement is true, most modern cars will do better with the AC on compared to the wind disturbance created by opening windows instead.

 
At 11/29/2005 11:08 AM, Anonymous Anonymous said...

Walking and running also burn different amount of calories--but thats not what this message-string is about. You stated that you get better gas mileage going slower. Then you said if you go slower you spend more time on the road "eating gas". This would imply that saving gas waste gas. The statement contradicts itself, therefore it is a false statement. Take a philosophy class.

 
At 11/29/2005 11:08 AM, Anonymous Anonymous said...

if you hop on a treadmill and walk a mile, you burn way fewer calories than if you run that same mile. I don't know where you got the idea that walking and running the same distance takes the same amount of energy...

 
At 11/29/2005 11:12 AM, Anonymous Anonymous said...

jessL 1. I drive a honda prelude 1991-2.2Liter-4cyl-automatic. I get 20-25 mpg. I think this is good, but my old last car-- a 1991 honda civic 3 door-- was unbelievable. I drove from Portsmouth, NH to downtown Boston on less than 2 gallons of gas! I did't even have to re-fuel until I was returning back on 95 North. I filled-up my tank every 2-3 weeks. Granted it was not a muscle car, It did get me where I was going.

 
At 11/29/2005 11:23 AM, Anonymous Anonymous said...

You guys are idiots. This is physics not philosophy.

You burn the same amount of kinetic energy in a car from point A to point B no matter how fast your going to get to point B. I dont disagree that going slower will give you better MPG but you will be on the road longer going that slow which in turn means you will be on the road longer. And if you go fast you will have worse gas mileage but be home sooner. So you spend less time on the road burning gas. They are equal fools!

This is funny. You guys just dont get it. Your not making the connection. Take a physics class for khrist sake.

 
At 11/29/2005 11:25 AM, Anonymous Anonymous said...

If you run for 30 seconds you burn more calories than if you walk for 30 seconds. However, more calories are burned during a mile walk than if you ran the same mile. This has to do with time. Most of your calories are burned to maintain homeostasis. It would be hard to messure what the exact amount of calories extra are burned during a mile run. Your body would also use more calories after a run than a walk because it would take energy to repair the tiny muscle tears caused by the run.

 
At 11/29/2005 11:29 AM, Anonymous Anonymous said...

Maybe the walking/running was too complicated for you guys. I know you burn more calories AFTER you run. And I know the human body is constantly burning calories. This is called a CONSTANT. Im talking from point A to point B. Nothing before you start and nothing after.

 
At 11/29/2005 11:31 AM, Anonymous Anonymous said...

Hey physics major.....Sir, you are an idiot. Gas mileage = distance traveled / gas used. "Distance traveled" is a constant in your example. So in order for "gas mileage" to be higher, "gas used" must be lower. So if you have higher gas mileage by going slower, like you stated, gas used must also be less. Simple mathematics (the basis of physics). So, no, they are NOT equal.

 
At 11/29/2005 11:36 AM, Anonymous Anonymous said...

I dont disagree that going slower will give you better MPG but you will be on the road longer going that slow which in turn means you will be on the road longer.

It's as simple as this: if you're getting 30 MPG, you will only need 3.33 gallons to travel 100 miles. If you're only getting 20 MPG, it will take 5. It doesn't matter how long it takes you.

 
At 11/29/2005 11:40 AM, Anonymous Anonymous said...

The statement about going faster while using the same amount of fuel is false because an increase/decrease in time is linear while an increase/decrease in speed becomes exponential.

 
At 11/29/2005 11:57 AM, Anonymous Anonymous said...

“This is funny. You guys just dont get it. Your not making the connection. Take a physics class for khrist sake.”

Wow, sounds like you need to take a refresher phyics course sir. Your statement makes sence in a vacume but that’s not where we live. It takes three times more energy to move an object twice it’s speed due to air resistance. Time for someone to go back to school.

 
At 11/29/2005 12:21 PM, Anonymous Anonymous said...

Well, the physics of car travel is a bit more complex than simple math presented so far.
The energy used to travel from point A to B depends on the number of factors, but to cut to the chase, you should consider what forces are involved. The car engine produces a force that moves the car forward. The tires and wind resistance, road inclination all produce resistance forces. The net difference (and the force produced by the engine must be greater than the resisting forces) is what moves the car forward. The amount of energy spent is the distance times the force produced by the engine (not the net force). So the gas mileage is (approximately) proportional to what the engine does. Now, from all the mentioned resistance forces, the air resistance is the biggest and it increases with the speed. Some cars are made to produce less resitance (more aerodynamic) than others. Simple rules like 1% worse gas mileage per mph over 55 are just crude estimates/propaganda concocted by the gov. In reality each car has a different performance (gas mileage) curve depending on speed. Some will get best mileage at 55, others will do fine even at 85.

 
At 11/29/2005 12:47 PM, Anonymous Anonymous said...

Man, you guys are going WAAAY too into this!! This isn't physics 101!! Your car gets the same amount of gas milage no matter how fast you go. Its the exertion that your car is making to reach that speed, whether it's a gradual increase in speed or a significant increase that determines the MPG that you get, in addition to other variables like wind resistance, drag, and common car maintence.
So enough about treadmills and calories and all that....

 
At 11/29/2005 12:47 PM, Anonymous Anonymous said...

People should just buy Japanese cars. They are far superior in actually matching the power curve to actual driving habits. Of course there really isn't a true rice burner muscle car, but that isn't what they want to do. Plus for all you anti rice car people, take a look at the percentage of parts made in the US verse any car from an "American" car company. You might be surprised.

 
At 11/29/2005 12:51 PM, Anonymous Anonymous said...

if you travel say 300 miles at 100 miles an hour, it takes 3 hours (assuming in a vaccum with no traffic) if you travel that same 300 miles at 60 mph, it takes 300 minutes, or 5 hours. Just because you are on the road for 2 hours more DOES NOT mean you are burning more fuel........unless you're and idiot......you see we measure the engine in RPM (revelutions per minute) if you're doing 100 at 6500 rpm, and 60 at 3200 rpm (THESE ARE ESTIMATES) so....at 3 hours at 6500 rpm, you're doing a total of 11,700,000 revolutions. 5 hours at 3200 is 9,600,000 revolutions. Now i'm not a rocket scientist, but i'd believe that means more energy is expended thus more fuel should be used.

True, it all depends on the specific engine and what it is tuned for. But for you to tell us that you're going faster and not spending as much time on the road, you're a grade A moron.

(note, all math was done in my 2005 BMW //M3 smg

 
At 11/29/2005 12:55 PM, Anonymous Anonymous said...

I totally agree. The Japanese aren't about making money on crude oil like us GREEDY AMERICANS..they are about efficancy and productivity, therefor...there cars are better than American cars..because our cars are made to bleed us DRY.
And the amount of parts made in America is a smaller margin than Japanese parts..because weknoe that they know what there doing and making products that work.

 
At 11/29/2005 12:56 PM, Anonymous Anonymous said...

The thing about getting better fuel economy by going faster to get off the road sooner is hilarious. It's even called "MPG" Miles Per Gallon, not Hours Per Gallon.

As for the power curve thing, certain vehicles get better gas mileage at certain speeds depending on their design. Most of you who are talking about getting better mileage by going 75 are driving SUV's and sports cars which will get poor fuel economy regardless of your speed. If you get something that's actually fuel efficient, like a Corolla or Civic, yes, going 90 with it is going to burn fuel, but anyone who's saying that it's poor design of cars that's doing this, not because some people like cars that are wasteful, is simply not based in any factual assumption or law of physics that applies to this reality.

--Clypheous

 
At 11/29/2005 1:01 PM, Anonymous Anonymous said...

My bicycle gets better gas milage than all your cars....beat that suckas...


Variable: Gatorade+Powerbar+Bicycle= Better Enviornment!!

Get some exercise fatties!!!

 
At 11/29/2005 1:03 PM, Anonymous Anonymous said...

I don't know much about cars and their "curve," but arrocding to physics, the drag (or the aerodynamic resistance) is what really counts in this situation. The equation used to calculate drag on a moving object: D = Cd x r x V2/2 x A. The faster you go, the more drag created, and the more gas you use.

 
At 11/29/2005 1:10 PM, Anonymous Anonymous said...

Hey Mr. Bycycle Man, how do you think your
"Gatorade+Powerbar+Bicycle" got to the stores where you bought them? Probably not on a bike...

 
At 11/29/2005 1:10 PM, Anonymous Anonymous said...

I have a 1994 Honda Acccord and get 32 MPG. If I get out of the car when at a light and run around the car 5 times, will the car use the same amount of gas as if I walked around the car 5 times? What if I skipped?

 
At 11/29/2005 1:18 PM, Anonymous Anonymous said...

yeah... it doesn't seem time really plays much of a factor... taking the example of 55 mph v. 75 mph (w/ the assumption that at 55, you get 30 m/g, and driving 20 mph faster, you cut your m/g by 25%, getting 22.5 m/g), your amount of gallons used per hour driving at 55 mph is 1.83, while driving at 75 mph, you use up 4.44 gallons (i got these number by diving mph by m/g). That's a huge difference. Despite it taking you 30 minutes less to get where ever you are going at 75 mph (versus 55), that time difference makes an almost no difference.

 
At 11/29/2005 1:20 PM, Anonymous Anonymous said...

My "Gatorade+Powerbar+Bicycle" gets delivered by a little old China man with a wooden cart and a donkey.

 
At 11/29/2005 1:39 PM, Anonymous Anonymous said...

Cars, especially Japanese and European cars have come a long way in fuel efficiency. In fact, if you ever drove in Europe, some of the cars there have efficiency indicators, and get this, it is on the RPM dial, not the speedometer!

The best efficiency is achieved at around 2100 rpm for the average car, though this can vary, obviously, depending on the power curve. So you can get similar mileage on highways or byelanes if your rpm is around that, even though your gears are different.

All other things being equal, that is the best way to get most mpg from your car. I could easily average on a summer day around 34-35 mpg on my commute in my vw passat, including both highway and city driving.

And, yeah, don't step on it too eagerly. Going easy goes easy on your wallet too!

 
At 11/29/2005 1:39 PM, Anonymous Anonymous said...

Cars, especially Japanese and European cars have come a long way in fuel efficiency. In fact, if you ever drove in Europe, some of the cars there have efficiency indicators, and get this, it is on the RPM dial, not the speedometer!

The best efficiency is achieved at around 2100 rpm for the average car, though this can vary, obviously, depending on the power curve. So you can get similar mileage on highways or byelanes if your rpm is around that, even though your gears are different.

All other things being equal, that is the best way to get most mpg from your car. I could easily average on a summer day around 34-35 mpg on my commute in my vw passat, including both highway and city driving.

And, yeah, don't step on it too eagerly. Going easy goes easy on your wallet too!

 
At 11/29/2005 1:49 PM, Anonymous Anonymous said...

wow...this is a great thread. very entertaining, with the occaisonal good point. Thanks for helping me kill some time guys. the statement that driving 55 mph will give you the best gas mileage only applies to the cars and drivers that had those results in the study. Every situation will vary due to all the variabls mentioned (wind resistance, acceleration habits, engine strain etc.) The ideal mileage will be achieved when all of the variables are at their optimum for that specific car and driver.

 
At 11/29/2005 1:58 PM, Anonymous Anonymous said...

I had a 1985 Mercury Cougar with a 5.0 liter V8. It was rated at 16 MPG city/24 MPG highway. I drove it for over 250,000 miles before I sold it. At 55 MPH on a highway/freeway I got between 24-26 MPG which was very close to its original mileage rating. At 65 MPH I got 30-32 MPG and at 77 MPH I got 39 MPG. 55 MPH might be great for a 4 cylinder car's mileage but it sure cost me money big time in the Cougar. At 77 MPH getting 39 MPG I got better mileage in my Cougar than my sister got at 55 MPH in her Honda Civic.

 
At 11/29/2005 2:05 PM, Anonymous Anonymous said...

I have always felt that I should tell the trooper who pulls me over for speeding that I am driving at the most optimum fuel efficiency for my car!

At least was that not the spirit of the law?

 
At 11/29/2005 2:25 PM, Anonymous Anonymous said...

Here's something to consider:

After numerous consumer complaints, there was a study done by the state of MI on how much gas is pumped vs. how much is billed, and the results were surprising. When the state auditors secretly test gas stations they have special tanks in their trunk that hold precisely five or ten gallons. At those amounts the pumps were right on. However, nobody pumps an even number of gallons into their vehicle. So the state did further research by using standard dollar increments then transporting the gas to another facility to measure the amount pumped against what they were charged. They found that in numerous gas stations, they were charged for significantly more gas than they had actually pumped. Apparently, the stations had illegally purchased computer chips that control the flow of gas and therefore rob consumers of up to $40,000 per month depending on the size of the station.

Is this why my mileage appears to be so bad? Nice to know were being f’d by foreign gas station owners rather than the gas companies.

 
At 11/29/2005 2:37 PM, Anonymous Anonymous said...

I was wondering why I could get 26 gallons into my 18 gallon tank.

 
At 11/29/2005 2:54 PM, Anonymous Anonymous said...

had a 1985 Mercury Cougar with a 5.0 liter V8. It was rated at 16 MPG city/24 MPG highway. I drove it for over 250,000 miles before I sold it. At 55 MPH on a highway/freeway I got between 24-26 MPG which was very close to its original mileage rating. At 65 MPH I got 30-32 MPG and at 77 MPH I got 39 MPG. 55 MPH might be great for a 4 cylinder car's mileage but it sure cost me money big time in the Cougar. At 77 MPH getting 39 MPG I got better mileage in my Cougar than my sister got at 55 MPH in her Honda Civic.

I really doubt your getting 39 mpg in a 1985 couger v8 lol. My 95 integra gets 25 mpg and my Mustang gets 15 mpg. That's like saying my Mustang can get 39 mpg on it's freakin v8? I doubt that.

 
At 11/29/2005 2:56 PM, Anonymous Bart said...

Have you ever noticed the fueling rate slows down at the gas station when you are pumping the last $25c or so... It is annoying waiting 30s to pump .1 gallons of gas. So, I'll bet most people don't bother with it. If you prepaid, you lose it. I'll bet this is done by design...

 
At 11/29/2005 4:17 PM, Anonymous SpinMan said...

We just got back to Georgia from an 850 mile trip (one-way) to see the Macy's Thanksgiving Day Parade. I experimented with our '05 Explorer before we left by setting the cruise control to 50 mph and was astounded at the 32 mpg I got. Needless to say I didn't want to spend 17 hours on the road, plus stopping time. As we set out on 85 North I set the CC to 72 and got about 19 mpg. Not too bad. But I noticed when there was any sort of incline, the engine downshifted and this really (in retrospect) killed the mpg. I happily spent the rest of the drive up and back with my foot on the pedal and got 21 mpg.

Where can I find the power curve for the '05?

 
At 11/29/2005 4:47 PM, Anonymous Anonymous said...

Fuel mileage is just that MPG the amount of fuel it takes to from point A to point B no matter how long it takes. Small cars have much less wind drag and require less power to move them at a certain speed. The more power you have to make to move your vehicle at a certain speed the more fuel it uses. The power curves and gear ratios determine which speed is the most efficient. To and from trips are not a good way to find out but you need to average both ways. One way could be up hill and the other down, or against the wind and with the wind. The larger the vehicle the more affects these factors will have.

 
At 11/29/2005 5:18 PM, Anonymous Anonymous said...

I had a 88 cougar and it got 30 mpg
However, I kept the speed about 55 to 60 mph. The aerodynamics on the cougar are different than a mustang. I had a friend that had a 88 mustang. He only got 20 to 25 mpg. They had the same 5.0 v8 engine. Their many factors and situations that can cause a car to get changing gas mileage. Weather,road conditions,maintance on car, type of car, type of gas, etc. Some cars a designed to perform better (gas mileage) at high speeds. Then there are others than perform better at slower speeds. If you can get 100 mpg out of a big block engine, great. Please pass the information to the rest of us.

 
At 11/29/2005 5:22 PM, Anonymous Anonymous said...

One HUGE thing that seems to be missing here is the effect that drafting has on your vehicle (mainly cars because their drag coefficient isn't nearly as bad as SUV's and trucks). I was driving down to see my sister and true to form the sweet spot for my vehicle (a 2006 Pontiac G6 GT) was about 60 (maybe 58 but you get the point). As the number of cars increased in front of me the sweet spot also increased. When I was behind about 4 or 5 cars the sweet spot was up to about 65 and when I was behind an entire line of cars the sweet spot jumped all the way up to 69-70. Now there are serious hazards in trying to draft with only 1 or 2 cars in front of you (sure clear distance) but when there is a huge line and everybody is going fast you get just as good mileage going 70 with the pack as you would going 58-60 by yourself. (This was tested by the automatic economy reading I get from my car). So next time if you're freaked out about mileage and a group of cars goes past you going 5 mph faster you should really think about joining (the further back you are the more streamlined the air becomes and the less your car has to do to move the air...)

 
At 11/29/2005 5:31 PM, Anonymous Anonymous said...

Ha it did take awhile for me to make a trip down to the cape from NH...I normaly get about 21-24 with my bonnivelle on high way travel going over 70. Going 55 to the cape i got an avg, og 35+ miles to the gall...it was awesome to save some green...but like you stated it i felt like i was barly moving compared to all the people going 70+ right by me.

 
At 11/29/2005 5:36 PM, Anonymous Anonymous said...

The only problem with drafting is everyone must run fairly close and not screw up. It take one to slow or stop and bam. Then, what you save in gas mileage is given to the insurance company.

 
At 11/29/2005 5:36 PM, Anonymous Anonymous said...

I'm amazed that people haven't brought up the fact that most of the cars on the road are flying bricks. The only cars that have any kind of aerodynamics are the Japanese cars. US manufacturers make huge SUV's and dumb asses buy them.... 1) they weigh a 10 tons, 2) they are are high off the ground with flat fronts, 3) they have large V6's or V8's in them to tow the boats people can't afford.... in essance people are driving cynder blocks down the road at 85+ miles an hour. People then wonder why they spend so much on gas - go figure!

 
At 11/29/2005 5:41 PM, Anonymous Anonymous said...

Flying Brick? Honda Pilot.

It was design to look like a brick.

The Japanese have their bricks too.

How about the Nissan Pathfinder and armada.

 
At 11/29/2005 5:47 PM, Anonymous Anonymous said...

look at the percentage of fleet makeup and maybe you will shut-up with your anti-rice comments!

Plus lets look at the top 3 fleet milage averages. Do you see any red-white-&-blue on that list?

I'm not bashing the american auto industry since they are only providing what consumers want. But as anyone can see, people are starting to get a little wiser and they are buying the lexus and Acura's instead of the Cadilac's because who wants to sit in an overpriced brick?

 
At 11/29/2005 6:09 PM, Anonymous Anonymous said...

Ya i understand but who wants to drive a ride with no get up and go?.........For sure not me... I mean really, who wants to drive a little ricer with no power!?.....But as i see it, 5mpg is not much of a difference.

 
At 11/29/2005 6:34 PM, Anonymous Anonymous said...

I really don't care! I have 2 Cadillac STS's with the Northstar V-8. I drive them as fast as I damn well please and the hell with that 55 mph crap! I lived that Carter era BS! I ran a radar detector back in the "Dark Ages" Never going back! Drive 100 dammit!!!

 
At 11/29/2005 6:54 PM, Anonymous Anonymous said...

Well, this was rather interesting for my first full blog read. As a PHD there are too many factors (variables) to decide what line of though is correct. I say use you good judgement and drive like a bat out of hell and dpn't worry about the extra z$3.00 it will cost you at the pump. Life is short. Have fun!

 
At 11/29/2005 6:56 PM, Anonymous Anonymous said...

okay rice cars are much better because they have engineers that actually have some kind of mental capability. I mean it doesnt take a rocket scientest to know that a 5-speed automatic is much more efficient then a 3 or 4-speed automatic. But who really cares about technical advances anyway. I mean the 80's transmission is such a stable design. Who cares about 5-speeds? That will just increase the cost of the care by like $200. Who cares that it will save you 3 to 5 miles per gallon?

 
At 11/29/2005 6:57 PM, Anonymous Anonymous said...

If you want better gas milage, i would suggest getting a moped or a bike.

 
At 11/29/2005 7:02 PM, Anonymous Anonymous said...

doesnt anyone get it..when gas prices were only 1.50 a gallon, did anyone ever freak out about the mpg that there cars are getting also no one ever critized the design of american cars.

 
At 11/29/2005 7:13 PM, Anonymous Anonymous said...

History shows that American cars took a big hit in the 70's & 80's with gas prices. The 90's were a fat time for American SUV's. Americans were fat and happy with all the dot.com gains. Now people are in trouble again because they have to choose between gas to get to work and christmas presents for their kids. Thank you Republicans! It is a big deal.

American car design has been critized for years. Does anyone read the car magazines?

 
At 11/29/2005 8:17 PM, Anonymous Anonymous said...

Excellent discussion. Many important things to denote; others, not so important, but they do keep all of us entertained. I think if you have the money to buy a big brick and have the money to pay for gas, then do it and don't complain. We are all affected in the same manner since we are all from different economical backgrounds. The country's economy is based on gas. We still drive eventhough gas prices went up. We still vacation and buy things.

To answer the question of gas milleage, RMP's is the key. Study your car at 55, 65, 75, 80 mph and there you get your answer.

 
At 11/29/2005 8:19 PM, Anonymous Anonymous said...

Driving 55 might improve overall fuel economy but doesn't the fact that the engine is running longer to get somewhere take away from some of that fuel economy?

 
At 11/29/2005 8:25 PM, Anonymous Anonymous said...

'Eficiency' is an important term used in physics. The same 'work' is done getting you home doesn't matter if it is fast or slow. 'Work' is another term in Physics but it does not translate into MPG. MPG has to do with the 'eficiency' that the 'work' was done at. I think Anonomous is very confused by some Physics terms and is very liberal as to the application of them.

Bill

 
At 11/29/2005 8:33 PM, Anonymous Anonymous said...

But some 8 cylinder engines shut down 4 of them at continuous highway speeds of 65 mph or higher, therefore the 55 mph fuel saving logic just wouldn't be very logical.

Rob

 
At 11/29/2005 8:38 PM, Anonymous Anonymous said...

Using math without the powercurve factored in. Assume 30 Miles per Gallon at 55MPH, and a 10 percent decrease for every 10 MPH faster. You get the following numbers

At 55MPH and 30MPG you burn 1.83 Gallons per hour.

At 65MPH and 27MPG you burn 2.41 Gallons per hour.

At 75MPH and 25MPG you burn 3 Gallons per hour.

So I go on a 300 mile trip.
At 55MPH it takes me 5.45 hours and I burn 10 gallons of gas.

At 65MPH it takes me 4.61 hours and I burn 11.1 gallons of gas.

At 75MPH it takes me 4 hours and I burn 12 gallons of gas.

Is that 2 gallons of gas worth me spending $4 more to get there 1.45 hours earlier? For me yes.

Remember you have to calculate TIME spent driving to see if you save (if any) money!

--BK

 
At 11/29/2005 8:38 PM, Anonymous Anonymous said...

Andy and Bob are driving 100 miles from City A to City B.
___________________________________________________________________________
First lets talk about Andy's trip...

Andy drives his car 100 miles at 50 miles per hour for 2 hours and gets 20
miles per gallon. When Andy arrives, he has burned 5 gallons of fuel.

[ 100 miles per 5 gallons of fuel used, or 100 / 5 = 20 MPG ]
___________________________________________________________________________
Okay, now lets talk about Bob's trip...

Bob drives his car 100 miles at 100 miles per hour for 1 hour and gets 10
miles per gallon. When Bob arrives, he has burned 10 gallons of fuel.

[ 100 miles per 10 gallons of fuel used, or 100 / 10 = 10 MPG ]
___________________________________________________________________________

Are you with me so far? Good... So now we can see that Bob got home in
half the time that Andy did. But, they both traveled the same distance of
100 miles. And no matter how long they were on the road, the fact of the
matter is that Andy burned 5 gallons of fuel and Bob burned 10 gallons of
fuel.

___________________________________________________________________________
Bob *was* indeed on the road for half the time that Andy was on the road,
but Bob still burned more fuel than Andy, because his car got fewer miles
per gallon than the miles per gallon that Andy got with his car.

 
At 11/29/2005 8:43 PM, Anonymous Anonymous said...

Get a job guys! For people who make plenty of money, like myself, I laugh at those who try to save $2 by creeping along at 55mph. Who gives a damn about 26mpg or 29mpg if you pull in $200k a year.

 
At 11/29/2005 8:46 PM, Anonymous Anonymous said...

i have a 2001 ford expedition which gets 12mpg going 55 and 10 mpg going 65 and over

I also have a 2006 yukon denali that gets 13mpg going 55 and going 65 and over it gets about 11

I also have a 2005 cadillac escalade suv that gets 14mpg going around 55 and about 11 going 65 and over

These are all based on 1 hr drives
As you can tell I love Suv's
P.S never get a Ford Excursion because I have had 2 of them and they got about 9 miles to the gal.

 
At 11/29/2005 8:48 PM, Anonymous Anonymous said...

if we are entering a fuel crises passing laws like 65mph and 70mph should have never been passed. Why were they passed well obvious to assist oil companies and politians in more votes. Do you think we should be more conscious of speed, considerations of drivers?

 
At 11/29/2005 9:10 PM, Anonymous GENSIX said...

All you guys MOVE back to Japan and leave me alone.

 
At 11/29/2005 9:31 PM, Anonymous Anonymous said...

Ok to everyone who did there little "tests" unless you tested it in an enviorment with CONSTANTS. Like Road conditions being the same, Temperature of the engine being the same and light times the same etc. etc. And having the only Variable being the Speed and (of course the RPM's at that speed) I really dont know how You can qualify to make such an analisys. But I did see a few smart comments which I am happy to see. Like the gentleman that pointed out that using rough figures once again. Example being if a car is moving at 60MPH @ lets say 2500 RPM's and it goes 100MPH at say 3700 RPM's
and you are going a distance of 60 Miles. Driving 60 MPH would take you exactly 60 Minutes. Driving 100 Would Take you 36 Minutes. So going 60 MPH would use a total of 150,000 Revolutions. And going 100 Would use 133,200 RPM's So in this case less RPM's in a Perfect enviornment would use less gas. But lets say when you drove this 60 Miles and you were driving and you had 0 stops. Then when you drove 100 MPH you had 20 Minutes of idle time, assuming you idle at ohh lets say for sake of argument 1000 RPM's Well now you need to add 20,000 Revolutions to the 133,200 figure. Now you are looking at 153,200 now driving 60 was more efficient. You see where I am getting at. Its an interesting theroy but unless you have a perfect situation and you can keep everything constant, you will be hard pressed to find an accurate theory to the hypothisis.

 
At 11/29/2005 9:39 PM, Anonymous Anonymous said...

I have one more thing regaurding this comment.

Get a job guys! For people who make plenty of money, like myself, I laugh at those who try to save $2 by creeping along at 55mph. Who gives a damn about 26mpg or 29mpg if you pull in $200k a year.

I too sir make good money, but if you do a study and ask any CEO, Business man, or pretty much anyone in this world. Would you perfer to spend more money on the same product? The answer (almost) everytime will be no. Maybe not for you money bags, but for everyone else yes. We all understand that it is dangerous, illegal and a waste of time to drive 55 MPH on the freeway. But at heart I think the argument here goes like this, We are paying too much damn money for gasoline.

 
At 11/29/2005 9:39 PM, Anonymous Anonymous said...

all u brick drivers go back to canada!

 
At 11/29/2005 9:54 PM, Anonymous Anonymous said...

I too have something to say to the money man about his glib remarks.


Mr. 200k-A-Year-Rich-Ass,

First of all, nobody here knows except for you if you really do make that much money. But if you do then here's a little something called reality; unfortunately, not everyone makes that much... we're talking about the average American here. There are two good reasons why you should try and conserve gas

1.) Iraq...Keep funding the foreign war machine and you will one day regret it. Think about it. The United States buys fuel from many Middle Eastern countries (i.e.- Saudi Arabia) which has been proven to fund terrorists over there. Throwing away money to themlike it is candy just to get your jollies off of speeding or because you don't care is a bad idea- it's giving them more money to buy suicide vests, materials to create I.E.D.'s (improvised explosive devices), propoganda, salaries, etc... and endagering our service men/women's lives.

2.) (And I do not mean to sound like a tree-hugger at all, because I'm not.) The enviornment... think of all of the pollutants going in the air this instant. Think of the pollutants the world itself gives off. No one is helping by having a heavy foot.

So the next time that you're driving down the road not "giving a damn" ask yourself... is it really worth it? Now, let's suppose that you really do make 200 grand a year and that you had nothing better to do but read some blog about gas prices when it doesn't affect you anyway... take it easy on the pedal, save some gas money, and put that towards something more productive.

Mr. Average Joe

 
At 11/29/2005 9:55 PM, Anonymous spetasal said...

Hey fools. If you want to save a few bucks drive slower, buy a smaller aerodynamic car. If you want to drive a gas guzzling SUV, truck, or whatever do it. Some people care to save money, some would rather save the time.

Engine Power curves, MPG, drag, one fish, two fish, red fish, blue fish...

Enjoy life.

 
At 11/29/2005 9:56 PM, Anonymous Anonymous said...

This board began about correcting the statement that better gas mileage is attained by driving slower. There were many good points so lets put them together and forget about car makes, manuacturer/gas company conspiracies, how much we have to expend on gas or how much is left and physics that don't account for resistance or change, but take into mind the most important variables that effect MPG:

-RPM-The higher the RPM, the more the engine has to work, thus using more fuel. Many Sports cars, such as the Corvette, are built with very high final gear ratios in order to allow the engine to gradually gain RPM and continue to push the car at high speeds. This means lower RPM at average freeway speeds (65-85 MPH), therefore using less fuel. Trucks, SUV's, and other heavy vehicles with large displacement engines built to move a lot of mass are forced to find efficiency and practicality using lower gear ratios, therefore forcing higher RPM at higher speeds. Remember, everything in the city where RPM is constantly changing is negligable, unless an electric motor is used.

-Friction-The more resistance (air, road, slope, unlubed mechanical workings throughout the powertrain and suspension, and anything else you can think of) a vehicle has, the more the engine has to work to push that vehicle, thus using more fuel.

-Acceleration-Power comes with more fuel and air. Power is needed to accelerate, but then at constant speed, such as on the freeway, it is used very little, and so is fuel. Some vehicles now come with engines where displacement is halved once cruising speeds are reached, because they are still using more fuel than needed. The more inconsistant motion, the harder the engine must work, thus using more fuel.

However your vehicle may be different depending on how its power is matched to its gearing and the amount of resistance it creates, these are the basic variables that effect the performance of your car's gas mileage.

 
At 11/29/2005 10:21 PM, Anonymous TrueRacer said...

I live my life a quarter-mile at a time, nothing else matters (not even gas prices)...for those ten seconds or less, I'm free.

 
At 11/29/2005 11:53 PM, Anonymous Anonymous said...

It's funny how no one has mentioned fuel injection? Did anyone notice that fuel injection has NOT done ANY better than carburated engines on MPG? Carburated cars did just as well if not better (considering the weight of the cars then) than fuel injected cars of today. (Take the SUV's of today in weight and wind resistance to the "boats" of yesterday). Did "technology" really do us any GOOD?? As one has stated here, why is it that new technology such as fuel injection hasn't done better, like 45-65 mpg? Has a third party influenced the manufacturers to make it harder for the consumer to "tinker" with their car? Fuel injection has taken away the capability of changing and setting carburators by the consumer. The best we can do is change a chip in a computer and hope the guy programmed it right so it doesn't hurt the engine. Plus, why is it that a "HYBRID" gas/electric car/suv does maybe 20-25% better than it's "standard" counterpart?? How can a "HYBRID" get 30-40 mpg if the "standard" version gets 22-32 mpg?? Doesn't seem like much of a "fuel" saver to me. I would expect technology that sent us to the moon in the 60's would have made a "HYBRID" of today do at least 50-60 mpg. So much for "technology". As for rice burners and European cars, maybe they are made to run on highways in Europe but I doubt it. If it was that much of a difference we would see a big difference in MPG comparing apples to apples (car to car same weight same size, etc.) Don't be so nieve as to think that foreign manufacturers aren't influenced by big oil, they are!

 
At 11/30/2005 12:20 PM, Blogger Phantom said...

Wow. It is nice to see how much out of line a discussion can get isn't it? It is almost like those who drive somewhere without planning ahead (yeah, those who cut you off to get to that exit..!)

As far as our "Little" test (as mentioned by some anonymous poster) I am sure we all did them with that constant. We are not all morons you know.

What I like the most is that people will most of the time take one sentence out of context and comment on it. Hence getting all over the place with a simple statement (heck, we even got to Iraq in this one here!!).
Just take your time, read ALL the comment then post more comments if needed.
When I said I did my "little" test, I also said it was over a million mile long...
Bottom line, this discussion is about finding how fast you can go before you start wasting fuel. 55 is NOT a magic number. This has been proven over and over . The 1980 Honda does 35 mpg, the 2005 Honda still does the same! This is where the problem lays.
Find out what your car does. (and yes, keep the test constant (ie: Highway, temp etc)
Some statements are good, some .. Well..
And the best you can do is get good driving habits...
Skip

 
At 11/30/2005 12:28 PM, Anonymous Anonymous said...

People need to remember that they are buying willingly cars that are rated for a specific gas milage. If oil prices go up, blame your Republican government that has direct ties to the oil industry. If the government makes higher fleet requirement minimum MPG's, I would think the auto industry would make cars that meet them. What incentive do they have to change? Nothing! - Government is big business. How else could these guys live the life styles they do!

At least when we had a Democratic president, he did push for increased fleet milage. Now that big George W is in office,he only care about his and his VP's holdings in the Oil industry.

Getting back to my point. People buy the cars with shity MPG ratings, so it is still their fault!

 
At 11/30/2005 12:43 PM, Anonymous Anonymous said...

that is the smartest comment on this whole blog. People need to take responsibility for their own actions. That being either buying a car that they can't afford to drive or voting in office people who have questionable track records of ethical dealings with industryand supporting the general public.

 
At 12/10/2005 9:37 PM, Anonymous Anonymous said...

In addition if you exceed the speed limit you also save time. My time is valuable so I chose to drive faster (given adequate driving conditions of course). I drive to Oregon from California twice a month. The trip is 405 miles. The last trip I averaged 75 miles per hour. I also averaged 29 mpg. The trip took 5 hrs and 20 minutes. If I stick to the speed limit the same trip would take 7 hours. At my rate of pay the extra hour and 40 minutes is worth about 42 bucks. It's unlikely that the extra 3 mpg I could squeeze out of my Saturn would ever be worth that much dough.

 
At 12/11/2005 2:21 PM, Anonymous Anonymous said...

I stumbled on this site by accident, and it has been very enlightening. I newer realized that there were so many mis-informed people, so ready to preach their flawed views. You guys are hilarious. It took almost 30 replys before some individual even mentioned PHYSICS... the real rules that are at work here. If anyone still believes that going faster (in atmosphere, not a vacuum - where a conventional automobile will not run) uses no more fuel than going slower (generally - not counting non-optimal gearing situations), you are mistaken. As one poster said, wind resistance increases geometrically with speed, thus incurring frictinal losses. Additional significant losses include DRIVELINE losses; an automatic transmission has HUGE losses, compared to a manual... about 30-40HP in a GM Turbohydromatic 400, and about 20 in a TH350. Sorry for the rambling... [most of] you guys were just too funny - the Physics-Impaired ones. This is High-School stuff... as long as you actually went.

 
At 12/11/2005 9:41 PM, Blogger Imran Anwar said...

Hold on folks. How can anyone make a generic statement that a certain speed X will save money for everyone?

From what I remember of studying about maximizing efficiencies in Physics, (in simple terms) there is a stage when rolling resistance and wind resistance curves come closest to each other.

That "point" is going to be different for different vehicles. There may be vehicles for which 25 mph may be the optimal speed and 55 mph would be wasting energy.

Similarly, a new sportier design car, with more aerodynamic design may achieve its optimum speed at 70 mph or some other number.

It is foolish to make it sound like driving really really slow will use the least amount of gas... sure, it will, but for a much longer period of time so you may burn even more total fuel before you reach your destination (especially if you cannot achieve the efficiency of running the engine at a constant cruise speed, preferably with a nice overdrive function).

These days the 55 mph speed limit is not driven by economics or engineering of autos, but by the economy of making money (indirect taxation) off speeding tickets.

That's just In My Humble Opinion. More at http://imran.com/media/blog/ .. Please read.

Imran
http://IMRAN.TV

 
At 2/01/2006 8:11 AM, Anonymous Keith Ray said...

I agree with Steve Hendry on the milage analysis. He's hit it right on the head. I drive a modified 87 corvette. I'm pushing almost 400 horsepower. My car is very aerodynamic and goes fast very easily. Normal cruising speed for this car is 80 - 90 MPH. At 90 I'm getting 24 mpg. I'm getting about the same at 70 or 80. I average 20 including around town and highway. At 55, my car struggles. It hates that speed and below. When I first built the engine, it was painful to drive 45. It bucked and jumped. My car doesn't start breathing right till it hits 80. The point is your best speed for mileage depends on many things. Aerodynamics, vehicle, gearing, cam lift and duration, cubic inches and computer programming. Where your malibu starts to be burdened at 70, I don't feel my corvette really using any muscle till I get in the 100 - 110 mph range. The point is, you need to get a feel for your car to get the best mpg. At some point your car will feel comfortable at a certain speed and will easily maintain the speed. Anything above that your having to lean into the pedal to maintain. If that's the case your using extra gas to keep that extra speed. Same goes for going too slow. If your making your engine struggle at a slower speed, "it will" require more fuel since it's struggling. I did some mpg tests for toyota in the 70's. When the engine was loaded heavily at a low speed even though I didn't open the throttle more, it sucked a whole lot more fuel. It's all in how you load your engine. If it's not struggling and breathing well, your probably near it's best mpg, unless your in a parking spot. :D

 
At 2/01/2006 4:33 PM, Blogger ESTEVAN said...

That is interesting. I have a 1995 Mercedes S420. At 65mph freeway, I get 21.75mpg and at 125mph, I get 21.25mpg. My 1990 SEL420 got 17.5mpg freeway at 65mph and 17.25mpg. Yes, I tested it twice. No, I don't drive that fast usually.

 
At 2/05/2006 10:21 PM, Anonymous Anonymous said...

Looks like that since I ca'nt drive anywhere right now,Looks like that when I do begin to Drive again I'LL just have to go A LIL FASTER allthough I told myself I would'nt.

 
At 2/21/2006 2:14 AM, Anonymous Jim said...

First comment: Liberals all want to tell you how to live your life. Hillary and her Dem cohorts want to control education, health care, promote abortion and faggot "marriage" and probably force all peasants to own rick shaws. I'm a conservative, not rich. I own a '95 Suburban to transport copiers and people. I've been experimenting with a new fuel additive see www.tecfuel.com and have seen increases from 11% to a wopping 38% Now, there are enormous variables which caused the variance in MPG. One was city driving vs HWY. Hwy mileage in my Suburban was good at 70 mph and slightly lower at 80 mph but I was also fighting a headwind and going uphill slightly. Weather might have played a factor. Coming back to Sea level and with less wind resistance, my mileage increased 1.6 mpg. At least 3 factors were at work and one of them was the decrease in speed because of the bad weather. I have a Honda Civic and I can't wait to test my gas additive on it. I believe in freedom. I believe we should be tough on terrorists. I applaud Pres Bush in many ways. My criticism of Republicans is that sometimes they placate idiot Democrats like Teddy, Barbara Boxer & Diane Feinstein. I am going to keep my weapons to protect my family, I'm going to call abortion murder, I'm going to point unbelievers and liberals to Romans 1:27. I'm going to remind France and England that they are courting disaster by allowing radical Muslims to take over..see Gen 16:12 (trouble makers whose hands are against their brothers. By the way how can any Jew be a liberal. A liberal Jew is an orthod-oxy- MORON (how do you like that?) Back to autos. Freedom rules, but if you can increase MPG and you feel good about it...go for it. This tecfuel also cuts emissions up to 80% because of more complete combustion. The reason is a physics phenomenon called Brownian Motion.

 
At 3/06/2006 5:44 PM, Anonymous Anonymous said...

Well no duh!!! You are going the same distance but faster so the fuel goes faster! I'd be willing to bet that it uses up the same amount of gas at 555 and 75.

 
At 3/06/2006 5:46 PM, Anonymous Anonymous said...

Just becuae u r going slower and the fuel gauge is dropping slower dosnt mean that u r getting more gas mileage

 
At 3/17/2006 9:31 AM, Anonymous Anonymous said...

I say that it all equals out. if you speed to a certain point like say 75 or 80 mph you use same gas going 65 mph. if you go 65 mph you will take longer to get to point b. if you go 75 mph its quicker to get there and yes uses a little more but it will all equals out. However I believe it will put more wear on your engine and your parts working harder to get you there.

 
At 3/22/2006 7:03 AM, Anonymous Anonymous said...

I have a olds Delta 88 and its get better from 55 to 70, and remember you need to break gravity then there is that window that your mileage should improve. the things that people need to remember is to keep the car or truck in good running order. I know hard to do with all the junk that the auto mfgs put out. but quality is the key to mileage, not 55. Honda gets 35 miles to gallon. Qustion auto makers, why should we poke around when the the oil companys go fast or has the goverment slowed down any? opinions are like butt holes, everone should have one rjf

 
At 3/22/2006 8:42 AM, Anonymous Anonymous said...

Gas costis the one thing. But you have to look over the overall cost of a trip.
Each year I go on a 1000 mile one way trip. If I drive 60 MPH it takes about 17 hours. But, uses 75 gal of gas, but need to stay in a motal room, cost $52.00.
If I drive 75 MPH takes 90 gal of gas, but I need not get a room.
So overall cost same or even less.

 
At 3/22/2006 4:57 PM, Anonymous Anonymous said...

Another economics issue: If I drive to work faster, I burn more gas than I would have burned if I had driven slower. But because I got to work earlier, I can work longer and make more money (which I will then waste on more gas). Smile!

 
At 4/12/2006 7:30 PM, Anonymous Dan said...

I drive a 98 Corolla and I'm not sure if going 70-75 is better than 60-65. Driving that slow absolutely drives me insane, so I always end up going up to 75, but 70 for the most part. So my question is, which is better: 60-65 or 70-75?

 
At 5/07/2006 3:23 PM, Blogger Ramsey said...

http://www.edmunds.com/ownership/driving/articles/106842/article.html

"This test was simple. For 50 miles we drove with the cruise control set at 65 mph. Then, for another 50-mile stretch we drove with cruise set at 75 mph. We repeated this test going in the opposite direction. It is amazing how obvious the difference in gas mileage was. Just think what would have happened if we had slowed down to 60 mph. The only problem is with impatient drivers behind you. One driver became so irate that he tried to run our editor off the road. Still, if you are pinched by gas prices. Leave a little early and drive the speed limit (in the slow lane)."

 
At 7/25/2006 12:06 PM, Anonymous Anonymous said...

Here are the facts: http://auto.howstuffworks.com/question477.htm

 
At 5/10/2007 10:45 AM, Anonymous Anonymous said...

There is an assumption that everyone has accepted that isn't true, that I thought I should point out. The assumption being that higher engine rpm equals more fuel consumption while under load. This is not the case. Given all other factors equal, vehicle speed, wind speed etc., running your car in a lower gear and therefore, at a higher engine rpm, will result in *lower* fuel consumption. The reason is because energy is stored within those revolutions, and it requires much less energy to main a constant rpm at a higher rate than at a lower rate, *while under load*.

I first started thinking about this during a real life experience many years ago. Our vehicle's automatic transmission developed a problem, and we were faced with many miles on the highway without the top gear. We were able to maintain about 45 miles per hour and still feel we weren't revving the engine to hell. The entire trip home, my father was concerned about having enough fuel to even make the trip. We were confused a little, as it seemed like the gauge wasn't moving so much, and that we'd be fine. Sure, revving the engine like this must be burning up a lot more fuel, right? Apparently not. We made this trip every day, and knew to the penny how much this trip costs us. We were extremely puzzled to learn that driving half of the round trip in this crippled state actually resulted in burning about 35% less fuel in total. Remember, 35% less fuel over the round trip, with only half of that distance at the higher rpm. Yes, we were going about 15 mph slower, and that is certainly a factor. But as soon as I owned a vehicle with a manual transmission, I've done my own testing, and have also found that keeping the engine rpm's higher, at the same driving speed, results in fuel savings.

If your automatic transmission has an overdrive option, I recommend you do not use it. Compare the results.

There is a lot of physics that go into explaining why this is the case, and I ain't going there. If you're interested, looked up things like intertia, centripetal force, flywheels etc.

And we should all be driving electric cars anyway. I don't need torque when I'm already going fast, I want it when I'm at 0, and I step on the peddle.

 
At 7/19/2007 3:01 PM, Anonymous Anonymous said...

Do the test yourself...

GasDandy is an easy-to-use tool that tracks a vehicle’s mileage and maintenance information, providing data that can be used for both business and personal purposes. By making these figures readily available, the program also gives the consumer the opportunity to save money and to proactively identify problems that can shorten the life of their vehicle(s). Download a free trial version of GasDandy today at http://www.gasdandy.com

 
At 8/07/2007 12:07 AM, Anonymous CreditDoc said...

My version is 90 km/h (56MPH)... I have a Ford Focus. So for me it's perfect!

 
At 11/06/2007 11:00 AM, Anonymous Anonymous said...

I have another way your readers can save money.
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The more aerodynamic your auto is, the less your speed will effect gas mileage. The converse is true. My brick of a truck gets 13mpg at 78mph. 55mph nets 20mpg.

I can live with 55.

Many other variables enter the 55 vs 70mph equation. Does it shift to a higher gear at higher mph? Does it have the aerodynamics to match? If auto transmission, is the torque converter locked or slipping? Is it burning efficiently at that RPM?

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{ Steve Hendry said...
I have a 2004 Corvette, at 55 MPH (I ran the test for 1 hour) I got 27 MPG. I then ran it at 75 MPH for the same amount of time, I got 28 MPG, hmmmm... why?
I then checked the RPM that my car was producing at each speed and the gearing. At 55 MPH, the transmission was in the same overdrive gear as at 75 MPH. Next I looked at the RPMs, I was at 1800 at 55 and 2100 at 75 MPH.}

If he was in the same gear at 75 mph as he was at 55 mph his RPMs would have been far different than stated.

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