for you to be making 36HP..... assuming a BSFC of .5, then you would be consuming fuel at a rate of 18 lb of gasoline per hour. that's almost 3GPH. at 60MPH, that's 20MPG.
you CANNOT calculate horsepower from that kind of equation. there are way too many variables that are missing, some of which you can't really measure outside of a dyno either.
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