You'd have to make the distinction between mpg us, and mpg imp.
A lot of mpg quotes from the factory weren't always feasible, like, yes, you could get 125+mpg on a 125cc, but only in a lab, on a constant speed, on a dyno. Not anywhere near real world experience.
Mpg somewhat goes directly opposite to fun factor.
It seems to me,if your final gear is short, and acceleration in it is peppy and fun, your motorcycle will do below 66mpg, pretty much regardless of engine size.
80mpg is normal acceleration, and 100+mpg is rather tall hearing with sluggish acceleration,that would make a great hypermiler bike.
Anything below 50mpg gives near to front-wheel-in-the-air kind of acceleration and any bike that has track power (think 660cc racing engine, or higher) has bottom mpgs in the 30s.
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