Audi's R-18 E-Tron diesel-electric hybrid has become the first car of its kind to win the Le Mans 24-hour endurance race. Audi and Toyota both submitted environmentally friendly racers, but the latter's LMP1 crashed, which left the German automaker to a 1-2 finish (while a pair of non-hybrid racers placed third and fifth, respectively). Unlike battery-based hybrids, the R-18 uses a hefty turbo-diesel V6 pu
