Audi A6 L e-tron concept

Earlier today, German automaker Audi unveiled the latest in its e-tron plug-in concept cars at the 2012 Beijing Auto Show. Based upon the A6 L, a highly-popular Chinese-only variant of the A6 sedan, the A6 L e-tron plug-in hybrid concept combines a 2.0-liter turbocharged, direct injected gasoline engine and a 70 kilowatt peak electric motor to deliver a total of 306 horsepower. Audi claims the concept is capable of traveling up to 50 miles in all-electric mode at a constant speed of 37 mph, but doesn’t detail how large the A6 L e-tron’s liquid-cooled lithium-ion battery pack is...