> Now here is the hard part: How much extra fuel my car need for the higher
> speed? I could not find any information to that. Is there any good page or
> statistics for this kind of information?
>

I think this is an interesting question. We know that wind force increases
with the square of the speed, so, if you double your speed, the force is
four times as much. Traveling over the same distance, the energy required
(force times distance) is four times a much. So, it appears miles per
gallon gets considerably worse as speed increases. However, going in the
other direction, miles per gallon goes to zero when speed is zero. So,
somewhere in there is a maximum miles per gallon. I wonder where it would
be for various vehicle designs.

Harold



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