2012 Honda Civic EXEnlarge Photo
Honda Civic Natural Gas
27 mpg city, 38 mpg highway, 31 mpg combined
Look at the numbers above, and you might wonder what's so green about the Civic Natural Gas. Well, the clue is in the name--although it's little more efficient than a regular Civic, natural gas burns more cleanly than petroleum products and emits less CO2 when burned.
Of course, it's less energy dense too, meaning the power and economy figures are nothing special, but it's also relatively cheap and the U.S. has its own natural gas reserves--so there are no foreign oil concerns for buyers.