You keep going back? There is an old saying, "Make a fool of me once, shame on you. Make a fool of me twice, shame on me". |
If you really must use the same station for some reason why do you not simply stand right next to them and make sure they put the basic unleaded in. It may come from the same pump but it certainly will come from a different tap. Similarly with your friends. Don't they actually watch them put the petrol in?
Don't misunderstand me. I'm not condoning their activity but the solution seems to be in your own hands.