I don't want to beat a dead horse so im making this new thread, after some searching on the net I found this Fuel tank size and other questions... which I am having the same trouble with. Yesterday when filling my tank, it filled 39L from running near bone dry (to make sure the tank was empty). A while back the car was unused for roughly 6 months in storage, I just wanna know if that could have anything to do with this, or if anyone know what this problem is.
First thing I'd suggest is that your tank was not near bone dry, but had another 20 or so litres left in it.
Second is that the filler hose at the petrol station was untra sensitive and clicked off way too early.
Third guess is that it was a very hot day which makes the fuel foam/bubble as it fills and tricks the auto cutoff.
I try to fill by mileage - every 300km rather than the gauge.
Good Luck.