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The energy efficiency of using electricity is pretty high, about equal to an all rice/beans diet. IIRC, rice/beans provide ~1-2calories of energy for every calorie of FF needed to get them to the table. The absolute best for food then is ~10-20 calories of FF per mile. Depending on the regional electrical mix, the well to wheel efficiency of electricity in the states is ~25-50%, so that places an e-bike at ~10-20 calories of FF per mile. If someone has a solar panel system, or even just a panel they charge alternate battery packs with, then there are effectively no FFs used for the fuel. Even a 100mpg, a vehicle is still at ~350 calories of FF per mile, so we would need to approach ~1000-2000mpg to see similar energy efficiency compared to a frugal/electric cyclist.
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