Actual MPG (KmPL)

[DFINITLYDISTRUBD]

Originally Posted by freeztar

Good deal. That sounds like a good trade-off all around.
I wonder where the diminishing returns occur when reducing velocity?

lot's to wind resistance especially on boxy vehicles like pickups...which also suffer more drag due to their cab bed layout...Caps make it worse. Plus remember most vehicles are geared to be at their best economywise at 55 to 60MPH....my truck gives it's best at 55 where I get 24Mpg on the highway where traffic is usualy blasting in the high 70's I get 10 to 14Mpg.

[alexander]

Hmm, fuel mileage

Interesting topic, you see, fuel mileage is dependent on so many factors, that even near-exact estimations are still far off and depend on too many factors.

Gas itself does vary, not only from supplier to supplier, but from batch to batch, yes sure its rated at whatever octane, but the sample tested was only a representative sample, then there is a percentage of addons added that will make gas explode better, or worse.

Air. Aside from the fact that moisture in the air effects how your gas burns, even more-so it effects the aerodynamic drag, heavier air is harder to move, thus on a humid day you will get a worse gas mileage.

Steering wheel. Even taking the same route, the distance you travel may greatly vary, depending on how many lane changes you do, how much correction you do when behind the wheel (to keep car going straight). Smoother you are, less friction your engine will haev to overcome

Who you drive behind. If you take the same route (say 50 miles) 2 days in the row, and first day, you are the only car on the road, and the next day, you are following a trailer (not too far, a couple of car lengths behind), you will notice a change in your fuel consumption, more so with more aerodynamic cars, as the already low drag coefficient will get cut down even more for a more noticeable change.

Gas pedal. more jittery you are on the pedal, harder (faster) you get on it, more fuel you will burn.

Stops. Here's the deal, unless you have a road that goes straight from your house to your work, no speed signs, no cars, noone will ever have to stop. Those stops introduce even more problems. Your car is most inefficient at touch-off, it burns more gas if you accelerate hard, it burns more gas if you come to a full stop, vs a rolling stop, vs no stop at all.... also something to consider

Air temp. Air temp makes the car liquids perform differently, on a cold day your car will get worse gas mileage until the oil, both engine and transmission, reaches the normal operating temps, and that may take quite a while...

these are my thoughts on the matter.... off to fixing something..... again