1) Metric tons, in billions, of greenhouse gases that vehicles emit annually: 1.7
2) Miles driven annually by the average American: 13,476
3) Gallons of gas, in billions, the U.S. used in 2011: 134
4) Cost, in dollars, of driving 25 miles in 2012's least fuel-efficient car, the Bugatti Veyron: 10.05
5) Cost, in dollars, of driving 25 miles in 2012's most fuel-efficient car, Mitsubishi's electric i-MiEV: 0.90
6) Dollars saved in five yeras by driving a vehicle that gets 30 mpg instead of 20 mpg: 4,480
7) Time, in minutes, needed to charge a plug-in hybrid electric vehicle's battery up to 80 percent: 30
8) Approximate number, in millions, of hybrid electric vehicles sold in the U.S. between 1999 and 2010: 1.9
9) Approximate number, in millions, of cars and light trucks soldduring that same period: 89.6
10) Fuel efficiency, in mpg, of the 1908 Ford Model T: 21
11) Fuel efficiency, in mpg, of the 2012 Honda CR-V 4WD on city streets: 22