The fuel readings have always been out, but not to this extent in my experience.
For all new boats, not just Bavarias, I recommend that a calibration of the gauge is done. Start filling with the tank near empty and record how many litres of fuel take the reading to 1/4 full, 1/2 full, 3/4 full, full on the gauge and when tank is actually full.
On my 2009 Bav 38, 1/2 full on the gauge is actually 1/3 full.
Craig
"Shirley Valentine"
Gold Coast
Australia