A fuel rewards program wherein awards received from the purchase of discount-triggering items at a first transaction are redeemed for a price-per-unit (PPU) discount on fuel. A scanner scans product codes and inputs the information to a POS system through a comparator such that a product may be determined to be a discount-triggering item. Information regarding the discount-triggering item is first stored in a potential buffer. A rewards process processes the information in the potential buffer and stores that information in a filtered potential buffer. A potential file accumulates basic information about one or more transactions. A purchase buffer stores all of the information, which is ultimately printed on a cash register receipt. The receipt may be scanned at a fuel dispenser to begin the redemption of the PPU discount on the fuel.