Audi's first hybrid car was the Q5, but now the German carmaker has also launched a sedan with the environmentally-friendly drive. The A6 can hit speeds of up to 100 kmhr on electrical power alone.Driving at a constant 60 kmhr, it can cover around three kilometres powered only by its electrical system. It employs the motors in unison when the driver wants more acceleration, while a range of instruments reveals different propulsion states. The hybrid A6 won't be on the market until next spring, but drive it! got a sneak preview.