6. 2012 Honda Civic Hybrid: 44/44 MPG
All-new for 2012, the Civic Hybrid gets a solid jump in fuel economy to land at sixth spot on the list with a 44 mpg city and 44 mpg highway rating. Much of the increase comes as a result of a new lithium-ion battery (replacing the old nickle metal hydride unit) and is the first example of a Li-On battery being used in a production Honda. In addition, Honda has replaced the 1.3-liter 4-cylinder engine with a 1.5-liter, meaning that not only is fuel economy up, but power gets a slight bump too, to 110-hp and 127 lb-ft.