Originally Posted By: parimento1
Wouldn't an easy way to get more MPG out of cars be to just raise the speed limit? I mean if you are traveling at 90mph instead of 50mph, aren't you naturally getting more MILES out of a gallon of gas by travelling faster, and getting to your destination faster?
No, it wouldn't. Gearing, aerodynamics, lots of things.
A Bugatti Veyron, for example, gets less than 10mpg, in US units, in combined driving.
Now, if you decide to run it flat out in your scenario, 254mph, sure, you get there fast. However, you'll empty the 26 gallon tank in 12 minutes. Just as well, as the tires would melt in about 15 or so.
The best milage I've ever gotten, at a steady 55, with the top up,and just the vents on, was, the car told me, was 44mpg. Do it on paper, it was more like 38 or so. No way would it get better doing 100.
Besides, the huge speeding ticket you'd get for doing 90 will more than wipe out any savings you think you'll get.