Quote:
Originally Posted by jeebus
Since [E85] gets roughly 65% the mileage of gas, that makes it a HUGE premium to run for us out here in our daily drivers. It's a valid option for track days though. 
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71% mileage at worst. This engine is direct injected and high compression, I think 75% is closer to what people will actually see.
Aside from that, the only way you'll change the shape of the powerband in this regard is changing the intake manifold to one with different length runners.