18. How many bikes can be parked in a single car parking space in a paved lot? Anywhere from 6 to 20.
19. Bicycles currently displace over 238 million gallons of gasoline per year, by replacing car trips with bicycle trips.
20. When Worldwatch Institute compared energy used per passenger-mile (calories), they found that a bicycle needed only 35 calories, whereas a car expended a whopping 1,860. Bus and trains fell about midway between, and walking still took 3 times as many calories as riding a bike the same distance.
21. Bicycles use 2% as much energy as cars per passenger-kilometer, and cost less than 3% as much to purchase.