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I went to the Chevron by my house and used my Amex PRG card and the pump said it was offering me a discount on the fuel prices and brought it down .10 below the cash price. Is Amex running a promotion with Sinclair fuel (7-11)?
Sounds like the gas station is doing the promo for using AMEX. Usually AMEX promos show up on the statement and not at the POS.