I guess the thing I come back too (at least for a gasoline engine) is the energy available in gasoline. If I'm tinking straight, 1 Gallon of Gasoline = 125,000 Btu, 1.0 horsepower (hp) = 2545 Btu per hour, so 1 Gal of gas is roughly 49 hp per hour at 100% conversiion efficiency. If 49 hp would maintain a vehicle at 60mph that would be 60 miles per gallon regardless of engine size.
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Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
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