Mine only reads half full with fuel pouring out on my feet.
I clearly need to master the art of
(a) Filling it up
(b) Understanding how fuel much might be in there when the pump first clicks
(c) Guessing how far I can drive on what I assume is in the tank.
I don't think I have ever had a car which poses so many intellectual challenges since I owned a Daf Variomatic which I bought from a second hand shop for £35