i'd say try for max torque at as low a rpm as possible and then get higher gearing with it. I've also heard that cryogenically treating your engine could increase your FE by 50%. I'm pretty sceptical about that but everything i've read said that crogenicly treated parts have 50% or less friction then they had before, so maybe it well cause the engines supposidly lose 30% of the energy to friction.
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