Didja know?
A human being traveling on a bicycle at low to medium speeds of around 10–15 mph (16–24 km/h), using only the power required to walk, is the most energy-efficient means of transport generally available.
On firm, flat, ground, a 70 kg person requires about 30 watts to walk at 5 km/h. That same person on a bicycle, on the same ground, with the same power output, can average 15 km/h, so energy expenditure in terms of kcal/(kg·km) is roughly one-third as much.
-Wikipedia
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