the last few gas stations I have been to had all of their labels they are required to have on the pump, including the one that said that the pump was temperature compensated, also the ground temp does not vary that much once you get below 5 feet like the tanks are at, as they are below the frost line.
Also, unless you leave your gas cap off the vapors are burnt and gas vapor burns, liquid fuel does not burn until it's vaporized.
one last nit pick about gas pumps and the sludge? have you not seen the filter on the pump? they used to be more visible on older pumps, but i don't see why they would install them on new pumps any more.
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