If it's fuel efficiency that you're after, it doesn't get any better than the 2011 Toyota Prius. Boasting a combined fuel economy of 50 mpg, the Prius is the most fuel efficient car in the US and the world's best selling hybrid. While not significantly different from the 2010 edition, here's a quick rundown of the key specifications of the 2011 edition of the Toyota Prius:

• 1.8 L, 134 horsepower, 4-cylinder 2ZR-FXE engine capable of generating 105 lb-ft of torque @ 5,200 rpm.
• EPA estimated fuel economy ratings of 51 mpg in the city, 48 mpg on the highway, and 50 mpg combined.
• Acceleration from 0 to 60 mph in 9.8 seconds.
• Electronically controlled continuously variable transmission (ECVT).
• Equipped with Toyota's patented Synergy Drive System which allows it to move at typical city speeds using electric power only; Two electric motors powered by nickel hydride batteries.
• Standard exterior features include UV reduction glass windshield, intermittent windshield wipers, and all season tires on 15 inch alloy wheels
• Standard interior features include digital instrumentation with speedometer and odometer, fuel gauge/consumption indicator, multi-information display with energy monitor and fuel consumption history, tilt/telescopic steering wheel, automatic climate control, power windows, locks, and doors, Smart Key system with Push Button start, and AM/FM CD player.
• Comprehensive standard safety features including driver/passenger Advanced Airbag System, driver knee airbag and front/rear side curtain airbags, side-impact door beams, and Toyota's Star Safety System (includes Enhanced Vehicle Stability Control, Electronic Brake-force Distribution, Traction Control, Anti-Lock Braking System, and Brake Assist).
• Seating for five and EPA cargo volume of 21.6 cu. ft.
• Optional Navigation System (Prius Three, Four, and Five), Solar Roof Package (Prius Three and Four), and Advanced Technology Package (Prius Five). Advanced Technology Package includes many innovative features like Advanced Guidance Parking System, Lane Keep Assist, Dynamic Radar Cruise Control, and Pre-Collision System.
• Estimated price range between USD $21,995 and $28,300 depending on trim and options.