The A3 Sportback e-tron is Audi’s first plug-in hybrid; optimistic European testing yields 157 mpg, but your results, as the saying goes, may vary. The Sportback e-tron is basically an A3 five-door with a 1.4-liter turbo four, an electric motor, and battery pack. Combined output is 204 hp; all-electric range is only 31 miles. Front-wheel drive and a six-speed automatic are standard.