I tend to forget this if a couple of years pass between visits, but I never forget that my US credit card doesn’t work at the pump. So I’ve gone in, presented my credit card, and asked for “fillup on 7, please,” only to be told, “just go pump it, then come back in.” This is Ontario, by the way.
Here in Murka, I’ve done a couple of business related road trips, and since the pump asks for my company card ZIP code (which I don’t know), I can’t pay at the pump. It used to be easy to say “fillup on 7, please” and leave my card, but now they ask me to guess the amount I’ll put in, which kind of defeats the purpose of a “fillup” because I have no idea what it costs. I’m inclined to use my own card (I’ll get paid back, of course).