Why is it that when I fill my gas tank, the pump indicates more / less than the owner's manual says?

The owner’s manual is not always correct because it is an estimate and/or several changes may have been made to the vehicle during production. In addition, a vehicle fuel gauge accuracy may vary from one fill to the next.


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1. Why does it seem as though when I begin to pump fuel into my vehicle, the display advances showing several cents yet it doesn't feel as though any gas at all has come through the hose?
2. Why is it that when I fill my gas tank, the pump indicates more / less than the owner's manual says?