4. Hyundai Elantra
For the max efficiency, you will need the Eco version of the Hyundai Elantra that comes with a 1.4-liter turbo-4 engine and a seven-speed automatic. The other versions are rated between 22/30 and 29/38 MPG, depending on which car you select, but the Eco has the fuel efficiency of 32/40 MPG.
