2012 Audi R18 Ultra (left) and 2012 Audi R18 e-tron quattro (right)So Peugeot's pulled out of prototype racing after losing an argument with the organisers over the amount of energy hybrid LMP cars can accumulate, and Toyota of all people have now stepped up to try to fill their shoes by making a petrol-electric hybrid. Audi has spotted this and countered with a diesel-electric hybrid, like an old train, only much faster and cooler. Its full name...