Quote:
Originally Posted by billwot
That's a myth. Fuel of course is stored in underground tanks, and the tank temps are essentially constant.
" Filling Up When It's Cold Outside
Get your gas in the evening or early morning - the fuel is cold, and therefore denser. The truth about this myth is that you can barely register a temperature difference, since gas is stored in cool underground tanks, so fill up when you want. There are no savings to be had by waiting until it's cool out."
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I should have added a smiley. It was part "tongue in cheek".
We are talking about few cubic inches a gallon for 20F degree shift.
Winter and summer, you might be able to measure it in some regions, but it's not going to make an impact on your fuel bill unless you can buy your summer fuel in winter and store it.
The gas industry apparently defines a gallon, a gallon at 60F.
In aviation when filling an airliner, you get your fuel in Kilos or Lbs because that matters and makes load sheets easy. Instruments are usually in Lbs per hour or Kilo per hour, because weight matters more than how full the wings are. However, the density and temperature of the fuel are noted when ordering and if beyond limits the fuel load adjusted. The fuel may get pretty damn cold at 40,000ft.