Gasoline, it doesn't only smell good, it also burns very good. A lot of engines work on gasoline and burn gasoline. Still, sometimes the gasoline doesn't burn up in the engine and is thrown into the exhaust. No big deal except for the fact that this results in some nice flames. The Ferrari F430 as wel as the Lamborghini Aventador LP700-4 spit some nice flames out of their exhausts!
