[mr0077]

And even if there WAS a couple of degrees rise in the gas between the underground tank and the vehicle (through the piping, pumping heat, etc.), it amounts to about one teaspoon of increased volume per gallon...I suspect the pump can't be calibrated that close (<0.001% error). The splashing (from pumping at full tilt) might cause another 1/2-1 teaspoon of gas to go into vapor form and be pulled out of the tank, so we're talking about 1/2 tablespoon or 1/4 ounce of difference in lost volume.