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If you want to increase efficiency you can:
Lower the temperature of the intake air (ie cold air intake...or plumb the intake into the cab!).
Open up the exhaust(cut the cats, cut the mufflers or both or duals...)
Reduce drag
Change your gearing to run the engine at lower rpm(not cheap)
Lower the load on the engine(electric cooling fans, synthetic oils, etc.)
I'm sure there is more but that's all I could think of right now.
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