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Still stumbling trying to just maintain speed but I could be lugging it, looking for hghest bsfc in a 50 cc engine!
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Max mpg is at 19 mph; 4300 rpm and 1,168 ft/mn piston speed. The 1000-1200 ft/mn piston speed "rule" seems true enough, often enough, that I use it for guidance when no BSFC chart is available. Eh- I don't even look for BSFC charts- I just calc the piston speed range. So optimal mpg speed for the Honda 50 should be 16-20 mph.
P.S. I don't recall the source but I read a claim for 348 mpg at 19 mph; so that didn't come from my piston speed calcs but it sure seems to confirm them.