Apparently, the universal trick to get more gas (petrol) into your car’s fuel tank, is to rock the car a little while filling up. This makes the fuel act like sand, settling tightly at the bottom of the tank thereby creating extra capacity that wouldn’t have existed otherwise.
All these years, I thought Ghana taxi & tro-tro drivers were the only ones privy to this classified info. I should have been silly and asked the man at the other pump this morning what he was trying to achieve.