Originally Posted by GPSHSLAX
I think the implication is that all pumps shut off at slightly different times not that the amount they report is incorrect. The take away being that you can't know you filled up the tank the exact same amount, so you can't know exactly how much gas you used.
I may be wrong though, I am of course assuming the perspective of another person, always a dangerous assumtion.
That is what I meant. They all shut off automatically and you can't know the exact amount that it stopped at on the previous fill up or the fill up that you calculate from.