Refueling: Only with a pump on the right, or sometimes on the left?

Hello together, many people put your vehicle when refueling always so that the pump is at the same side as the tank cover (with German cars as well as the SL this is usually right, with Japanese m.W. mostly left). Since usually to the right of the pump is rather space, I often also place myself there and lead the pump gun with hose then just over the trunk around to the tank cover. Usually this is also no problem as long as the hose pulls out How do you handle this? On this subject, I thought of a question to the pump guns technicians: Is the sensor, which provides for the automatic shut-off, not at the bottom of the regular gun and when it is turned into the tank sockets (if you are just right of the pump) rather above, so that the gun should then switch off later and the tank should become fuller. If, depending on the tank geometry, the tank is still in width at the level of the filler nozzle and not only the nozzle comes out at the top? This would perhaps explain steady deviations between the on-board computer display and the calculated consumption in part.