I didn't realise they use a float, that's reassuring that even when it reads zero there are a around a couple of litres in there. Not that I plan to use them
I will try the full tank trick, to try and calculate how much was in there. That's assuming the VCDS reading at full tank is accurate also.
The petrol station is only 0.4 miles away so I won't lose much fuel getting there.
I do wish they used a more accurate sensor, and a litre display on the dash, it is more reassuring to see how much fuel is left rather than some range calculation. They could have displayed both anyway!