I once filled up with petrol at a supermarket, the only problem was that the tanker delivery man had filled the petrol tanks with diesel, with it mixing with the petrol already in my tank, I did not immediately notice any difference. But then I did and chugged it back to the supermarket filling station, where there was a whole lot of motorist with the same problem. The supermarket pais for a meal for us all while they organised the vehicles to be taken to the local garages, and arranged taxis to take us home. Must have cost them a bomb. Son't know what the garage did to my car but I did not have any trouble with it, due to this event.