said by MaynardKrebs:
You *might* gain some energy content advantage is you filled up in the winter just after the underground tanks were replenished, if the tanker had traveled 200 miles in -20F weather and chilled the gasoline.
To quantify that amount...
Gasoline expands about 1.2ml per liter per 1 degree C increase in temperature. The variation between -20F and the baseline 15C is approximately 44C. That gives you the equivalent additional energy as an extra 52.8mL at the baseline temp, or a 5.28% advantage. Putting that in terms of units Americans would understand, that's like getting an extra 7/8ths of a cup of gas per gallon.
It usually averages out though for non-ATC pumps. Because for tanks that you might get at -20F, you may also get gas at 80 or 90 degrees and you lose the advantage.