@LanceLafontaine: Naah, physical chemistry. It just has to do with changing volume by temperature. Remember, it's "gasoline dispensed". It's not talking about any changes to gasoline's chemical properties which may or may not happen in the engine--that's more of a chemistry question. Depending on it's form, if it was asked on chem.SE, we might have kept it. Since it fits here as well, and has an answer, there is really no need to migrate at all. — Manishearth 2 mins ago