Well if the station ever looks closely at the records, the clerk is in for a federal indictment and a lost job I would think.

I would think that the station would have software to autocatch such abuse (or the clerks cc co would be like hmmm how much gas can someone buy...'

Hey at 5% cash back on many cards u can see the attraction

I think the Costco Amex capped their gas purchase rebates in the last year or two ....