Bill Clinton might say something like .“it depends upon what you mean by a full tank”. IMO, it’s full when the first click of the nozzle shuts it off for you. It’s a pressurized system that is temperature dependent to some extent and does the adjustment for you. Just stop filling there, put the cap on, pay your bill and drive on. The tank is “full”. Everything changes volume when temperature changes. Don’t over think it. VDC is right.