No. 9: Saturn Aura Green Line

EPA-estimated mileage: 24/32

Known as a mild hybrid, the Aura Green Line delivers modest mileage improvements over the four-cylinder Aura — 9 percent in the city and 7 percent on the highway — but its price premium is a mere 12 percent. (Note: Chevrolet will soon also market a mild hybrid version of its Malibu. Later on, 2 Mode hybrid versions of each are expected to join or replace them, adding efficiency and cost.)want car loan