Until recently, using anything other than a gasoline-powered engine in a racing car was not an option.
Audi changed that in 2006 with its Le Mans-winning, diesel-powered R10 TDI, Peugeot followed suit with the 908 HDi FAP, and suddenly race viewers and race car drivers alike were treated to a different set of sounds.
This year was even more interesting. That’s because in the 2012 edition of the 24 hour race, both Audi and Toyota fielded hybrid-powered entries, the former filling all three places of the podium and the latter showing that it was a force to be reckoned with before retiring.
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