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You failed to take account for the fact that cars are two orders magnitude heavier than bicycles.

Nobody mentioned cars.

This little 125cc motorcycle get 125-150 mpg. Tops out at 55mph.

https://powersports.honda.com/street/minimoto/trail125-abs

A gallon of gas is 31,000 calories according to a quick Google search. I could ride a lot farther with those calories on a bicycle, albeit over more time.

What if we attach a combustion engine to a bicycle?

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