9. Lamborghini Aventador
The mean Italian bull brings to the United States one of the least efficient vehicles. City fuel mileage for the Aventador is a measly 11 mpg as estimated by the EPA. Highway fuel mileage isn’t much better at 18 mpg. Of course you have to consider the supercar comes with all-wheel-drive, which is never kind to a vehicle’s fuel mileage, as well as a monstrous V12 engine that begs to be driven hard so it consumes the gas as fast as you can pump it into the tank.