U.S. gas stations discount cash payments

Growing numbers of U.S. gas stations are offering discounts of 3 to 15 cents per gallon to customers who pay with cash instead of by credit card.Over a year's time, you save quite a bit, customer Craig Hummel of Newport Beach, Calif., said at a Valero Energy Corp. station in Costa Mesa, Calif.The gas stations offer the discounts -- or, as critics argue, charge a premium for credit-card purchases ...