Don't know if the claims are true, but over 100 mpg should be easy with 50-80cc's and geared properly. Take a look here 99cc PREDATOR FUEL ECONOMY ? - Motorized Bicycle: Engine Kit Forum
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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