The EPA has updated its fuel economy ratings for the 2011 model year, with the Toyota Prius retaining its title as fuel economy king despite challenges from several other worthy models.

The Prius topped the list of models with 51 city/48 highway miles per gallon. Yet for drivers looking to go green and save at the pump, the Prius is far from the only option, as most major manufacturers now offer a variety of cars for sale with high fuel efficiency ratings.

At second place on the list, for example, was Ford's trio of hybrids: the Fusion, Lincoln MKZ and Mercury Milan. All three of these vehicles have varying features and styling, but each comes with a 41/36 fuel efficiency rating that should keep drivers' wallets a little heavier every time they head to the pump. Ford's 29/40 Fiesta also won the subcompact category, barely edging Toyota's 29/36 Yaris.

Honda also posted a strong showing, with the automaker's Civic and Insight hybrids each achieving 40/43 for fuel economy. The CR-Z crossover was considered the most efficient two-seater at 35/39 in the automatic version and 31/37 for the manual.

Large sedans aren't typically thought of as being particularly efficient, but the top two entries on the list may change skeptic's minds. The Hyundai Sonata leads the class with a rating of 24/35, while Honda shows up again with the Accord at 23/34.

Although the Prius was king again this year, it's likely to be the last win for the popular hybrid. This year's list didn't take into account the Nissan Leaf and Chevy Volt, upcoming electric vehicles that are said to best the hybrid's efficiency ratings.

The agency also released its list of the least fuel-efficient vehicles in various classes. Unsurprisingly, luxury vehicles like the Aston Martin DB9 and Rolls Royce Phantom topped the list, along with the Bugatti Veyron supercar, which gets just 8 miles per gallon in the city.

Hybrids may save drivers money at the pump, but the fuel efficiency often comes at a premium on the dealer's lot. Buyers who wish to save on a hybrid may want to shop for one on the used car market, where they can often find deals compared to new vehicle showrooms.