6. 2013 Ford C-Max Energi
Miles per gallon: First 21 miles: 100 mpge combined. Next 600 miles: 43 mpg combinedIf C-Max sounds like the name of a battery, it's not a bad pick for a car that's among the most affordable plug-in hybrids on the road. It may looks a whole lot like the Prius, be priced similarly to the competing Prius and do some very Prius-type things, but Its plug-in range is a full 10 miles better than the competing Prius. Not only that, but it's assembled in Wayne, Mich., and has "Made In The U.S.A." clout the Prius can't claim. It also gets all those sweet Prius benefits such as state and federal refunds and solo carpool lane access.