Scheduled to launch in 2012, the Audi A8 hybrid combines the best of two worlds. Its gasoline engine - a 2.0 TFSI - and an electric motor develop peak output of 180 kW (245 hp) and 480 Nm (345.03 lb-ft) of torque for short periods of time. The luxury sedan can travel up to a speed of 100 km/h (62.14 mph) on electric power alone, and covers around three kilometers (1.86 miles) with zero local emissions...