0 litres VCDS fuel level

[Goran]

I always trusted the fuel level in litres measuring block in VCDS.
So yesterday I was driving back home when the fuel level warning came on. I knew, or thought I knew that from that point I had 12 litres left. The trip computer said I had 100km range left and as it happens I had 102km to home. We all know the trip computer is a bit cautious and that there can be several miles range left when range drops to zero.
So the range did finally reach zero after 99km (pretty accurate?), and Indrove on for another 3km to home. Got home fine no funny noises from engine or fuel pump, so I assumed must have a few litres left in there.

Out of curiosity today I checked the fuel level in VCDS and was disturbed to see 0.0 litres left!

I am sure there was at least a litre left in there as there were no signs of fuel starvation.
Just to be on the safe side I take a5l fuel can down to local pertol station only 6mins walk away, fill up 4.5l.
After I pored it in the tank I check VCDS fuel level, now the reading keeps toggling between 3l and 4l, so split the difference he fuel gauge thinks there are only 3.5l in the tank when in reality its at least 4.5l more likely over 5l.

Conclusion, VCDS fuel level reading is not accurate either.