This evening, I attempted to buy petrol from a Chevron station in Renton, WA, USA. I put my (Australian) Visa card into the pump and it demanded that I enter my 5-digit ZIP code! Of course, I have no such thing. I tried entering my (4-digit) postcode, but it didn't accept that. Of course, my card has a PIN, which is the proper means of identification for cards, but it didn't give me the option of entering that. I later went to a different Chevron which didn't have this stupid setup.

Does anyone know anything about this? I've never experienced this anywhere before. Is it a Chevron stupidity or just this particular outlet or what?