As stated before, you need to figure out the BSFC for the ENGINE rpm (that's how they're rated) then determine what you'd like your target cruising speed to be. Then calculate what rear end ratio you'd need to have your engine be at the best BSFC for your target cruise speed. This is alot of work but if you're looking to max out your efficiency it really is the best scientific way to do it. Among skinny tires (less rolling resistance), light wheels (less unsprung weight) and aerodynamics (less drag).

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