Quick – what’s the most fuel efficient car currently for sale in America? Did you guess the Toyota Prius? If so, give yourself a cookie, you’re right. According to the U.S. Environmental Protection Agency, the 2010 version of Toyota’s seminal hybrid once again scores the mileage victory with its estimated 51 mpg city and 48 highway numbers.

Second place is grabbed by a set of newcomers to the hybrid arena for the 2010 model year: Ford’s Fusion sedan and its sibling from Mercury, the Milan. The Blue Oval’s hybrid duo earn EPA ratings of 41 city and 36 highway, making them most fuel efficient midsize sedans in America.

Rounding out the top 10 vehicle platforms are the Civic Hybrid and Insight from Honda; the Lexus HS 250h; the Nissan Altima Hybrid; the Ford Escape, Mazda Tribute and Mercury Mariner hybrid ‘utes; Smart’s Fortwo coupe and cabriolet (the only non-hybrids in the top 10); Toyota’s Camry Hybrid and finally the Lexus RX 450h.

Want to know where your next car comes in on the federal government’s list for 2010? Click here to find out.

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