I don't think the area you were in had anything to do with it. The zip code is supposed to match the card.
And you don't have to guess the exact amount of fuel, you just pick a number greater than the cost of a fill-up and less than infinity/your credit limit.
Yeah that I gathered, but the closest thing to a zip code we got here in Norway is four digits, and it didn't accept that.
> you don't have to guess the exact amount of fuel
Of course, but the cashier forgot to mention that I'd get back what I didn't use, and being a bit off balance already by the new experiences I didn't think of this myself.
And you don't have to guess the exact amount of fuel, you just pick a number greater than the cost of a fill-up and less than infinity/your credit limit.