32 City / 42 Highway / 36 Combined
$19,450

Honda has two of the most fuel-efficient cars in America on this list: the Fit, and the turbocharged Civic sedan. With the smaller 1.5-liter engine and a continuously variable transmission, the Civic gets 32 miles per gallon in the city, 42 on the highway, and 36 combined. Owners should expect to pay an annual fuel cost of $1,050.