the difference in price is due to the credit card company servicing fee. Usually around 3% but you can broker for a cheaper rate.
someone at O'riley mentioned using your debit card they charge a flat rate per transaction and not a % of all transactions.
so by paying cash you save the gas station the service fee.
Sometimes when I do pay cash I give them more than the tank will handle. then I have to go back in to get the difference.
patrick
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