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Get a bicycle crank and a passenger, let the passenger pedal up the alternator?
I doubt it would make a 3 mpg difference on a stock 94-02 Z28 with T56 (0.50:1 sixth = 1500 RPM @ 65 MPH = 30 MPG)
I doubt it would make a 1 MPG difference on a big block dually. Only a micro mini baby engine could suffer so badly, and who wants to suffer a micro mini baby engine? Maybe a V8 with a T56 and a 2.14:1 axle in a Geo?
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