hmmmm now have you ever filled your 20 liter can to the 20 liter mark on the jug? yes it has a mark, if ya get 25 liters then I'd believe ya, you are likely filling the expansion area of the can, could be interesting when it gets warm. may just see all your hard earned money evaporate down the drain.
if you register a complaint, i think they will check the pumps accuracy, at least what i was told.
