Interesting thread, but 10 years old...
Actually you can stub out a cigarette in petrol as well. Those films where they throw a cigarette to start a petrol fire are just fiction. But don't try to use a lighter to light a cigarette.If this was a diesel spill as it sounds, its highly unlikely to start a fire. To burn diesel, it needs to be compressed or vapourised, so in theory you can safely stub a ciggarette out in a puddle of diesel. Wouldnt recomend you try this by a petrol pump though