Here is my experience with refuelling my 2009 petrol Avensis. I think the gauge gives a big reserve especially when low. I go to fill up and sometimes when opening the filler cap, there is a rush of air, sometimes with a 'burb'. Then when filling begins, the pump shuts off. I have to start slowly, and make sure the pump nozzles is aimed towards the front of the car. After a slow start, I can pull the pump trigger fully until it get close to full when the pump auto stops. Then slowly top off