# The bicycle is one of the most efficient invention

Did you know that the bicycle is one of the most efficient inventions in the history of mankind, getting the equivalent of 912 miles per gallon (388 km/ltr).

“It turns out that “”biological engines”” — which is what the muscles in your body are — are pretty amazing in terms of efficiency. To find out how efficient, let’s look at how many calories a person burns while riding a bicycle.
If you look at a page like this calorie chart, you will find that a person riding a bicycle at 15 miles per hour (24 km per hour) burns 0.049 calories per pound per minute. So a 175-pound (77-kg) person burns 515 calories in an hour, or about 34 calories per mile (about 21 calories per km).
A gallon of gasoline (about 4 liters) contains about 31,000 calories. If a person could drink gasoline, then a person could ride about 912 miles on a gallon of gas (about 360 km per liter). Considering that a normal car gets about 30 miles per gallon, that’s pretty impressive!”