I give stores the wrong zip code.
I think if you give them the wrong zip code then they won’t approve your credit card. Now if you pay in cash that probably won’t be a problem giving out your wrong zip code, but if you are buying gas and give another zip code, they will decline the card saying that it is not the billing zip code.
I guy I know who lived in L.A. told me a whole lot of people always use 90210 cause they’re vain enough to want everyone to think they’re from Beverly Hills (even though they’re not)
Self-serve gas pumps require it when purchasing with a credit card and before approval authorization. I suspect it’s to prevent stolen or lost cards from being used to purchase fuel.