This is an interesting graph - too bad they didn't extend it to
slightly higher speeds (and also too bad that it isn't more recent):

http://en.wikipedia.org/wiki/File:Fuel_economy_vs_speed_1997.png


On Sat, Jul 17, 2010 at 4:46 PM, RussellMc <apptechnz@gmail.com> wrote:
>> I think this is an interesting question. We know that wind force increas=
es
>> 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.
>
> Energy per time aka power is thus proportional to the cube of speed,
> all else being equal.
> Carl's Cougar shows that all else isn't equal :-).
>
> Even if it were, reduced trip time at increased speed makes Harold's
> Harol'd square law correct for absolute energy trequired and thus fuel
> required.
>
>
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Russell
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