Indonesian farmer on a bicycle
Photo by CEphoto, Uwe Aranas
A bicycle is the most efficient machine in terms of energy expended for moving weight over distance.
A human on a bicycle is also the most efficient animal on earth in terms of energy spent for travel.
Bicycling is six times more efficient than walking.
Using a bicycle, it takes 35 calories to move an average-size person one mile (1.6 km). It takes 1,860 calories to move a person a mile in a car. So, the bicycle uses two percent as much energy as a car.