Audi 100 Duo II
Audi 100 Duo second generation concept car was introduced in 1991. It featured Audi's "trademark" quattro permanent four-wheel drive system. Powered by a four-cylinder 2.0 L engine with 85 kilowatts (116 PS; 114 bhp)), with a 21 kilowatts (29 PS; 28 bhp) electric motor for the rear wheels when required. In electric mode the front axle was disconnected, and in this mode the Duo could reach a claimed top speed of 65 km/h (40.4 mph) and the sodium-sulfur battery sufficient for 80 km (49.71 miles).
Read more about this topic: Audi Hybrid Vehicles