An average human being gets 400 miles per
An average human being gets 400 miles per gallon at 3 mph. “A 155 lb human walking at 3 mph will burn 246 kcal/hour, or 82 kcal/mile. Feed that human one gallon of gas in potential energy — 31,548 kcal — and he’ll have enough energy to walk for 128 hours.”
Update: Riding a bike increases the MPG to ~750.
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