The Casey’s convenience-store chain is facing a potential class-action lawsuit alleging it overcharges consumers by advertising in-store discounts that aren’t applied to purchases at the cash register.

The lawsuit, filed in U.S. District Court for the Southern District of Iowa, names Casey’s Retail Co., Casey’s General Stores Inc., and Casey’s Marketing Co. as defendants. The companies operate more than 2,500 convenience stores in Iowa and 15 other states.

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