5. 2013 Toyota Prius Plug-In
Miles per gallon: First 11 miles: 95 mpge combined. Next 529 miles: 50 mpg combinedThe Prius Plug-In is a bit of a misnomer given its scant electric radius. A three-hour charge to go a scant 11 miles without using gas implies not only an impossibly short commute, but infinite patience. Fortunately, the Prius makes up for its lacking electric mileage with 50 mpg hybrid mileage that's still near the top of its class. It also gets owners some sweet state and federal rebates for their trouble, as well as an occasional comfy solo ride in the carpool lane.