@jhawk801: MYTH: Getting gas when it's cool out saves you money. The theory - cooler temperature makes the gas denser. But is that true? While gas will be denser when it's cold because there's less heat causing it to expand, this doesn't play into affect when filling up. Gasoline is stored underground, insulated from the outside temperature. So next time you're filling up, remember that the time of day or temperature has absolutely no impact on it. #carrepair #funfacts #carlife