Toyota Camry Hybrid
Camry Hybrid returns the best fuel economy of any sedan.
EPA estimated mpg: up to 52 combined (51 city/53 highway)

Honda Accord Hybrid
EPA estimated mpg: 47 combined (47 city/47 highway)

KIA Optima
6-speed automatic transmission and 2-liter Gasoline Direct Injection (GDI) engine, it offers a combined 271 lb.-ft. of torque. EPA-estimated 39 mpg in the city, 45 mpg on the highway, and 41 mpg combined.