Best bike for mileage of all that I owned was a 1965 Honda Super Cub at 170 mpg. Best bfsc in smaller engines is at higher rpm. The cub got that mileage running at 6k rpm and it's top speed was 42 mph.
Larger engines will have best bfsc at lower rpm, but super high mpg vehicles are generally not high speed vehicles. I have always liked to see people who get top mpg list their average speeds. In most cases those average speeds are close to half what I average, and not many people will tolerate a 22 mph average speed, while mine is much closer to 40 mph.
regards
mech
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