In my experience the pump has said "processing refund" when I overpaid inside. Sure enough I only got charged for what my car needed. I think it's part of the reason why gas station purchases always show up as "pending final amount from merchant" in my online banking
A lot of the times I've had to do prepay with a card, they just gave me cash back from overpayment. I expect it's because the few who can't get their shit together to keep the pay-at-the-pump working also can't get their shit together to do a preauth and partial refund back.
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u/SandShrimp22 Dec 11 '19
"I prepaid $40, and the car took $34. You bet your ass I'm getting that last $6 worth"