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Craig Vetter does a motorcycle mileage race each year where the contestants have to maintain a typical highway speed on a road race track. Unlike most bikes that have little or no true aerodynamics these do. MPG at 60+ MPH is anywhere from 100 - as high as 470 MPG.
I have his CD where he stated that a typical motorcycle only needed 125 - 250 CC's and about 18 HP to be practical. Now think if you gave it 30 HP and a high efficiency engine on a truly streamlined shell what it would do on the street.
Remember stop and go is all about weight and cruise is about drag.
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