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Yes, you can usually pay inside. Also, just entering any 5 digit zip code will often work. Had no issues with random 5 digit zip codes and my UK and HK-issued cards at gas pumps in the USA.

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Weird, I tried my friends' zipcode and it didn't work. Maybe I got it wrong or something.

It probably depends on the company. Most gas pumps in the US only support swipe payments (as opposed to chip based EMV or contactless). The gas station gets charged lower credit card network fees if they submit address info with the swiped payment. Whether the address is correct or not doesn't affect the fees, and it's usually up to the company to decide if they want payments to be declined when there's an address mismatch.

Mismatch between which addresses?

Why can’t I fill my car anywhere, regardless of where I live?

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