Near my house is gas station that offers different prices for credit card and cash purchases. The credit price is six cents a gallon higher than the cash price. At the cash price, their gas is among the cheapest in town, often only challenged by a few other places that charge more for credit card purchases or cash only places, and even when paying by credit card it is still relatively inexpensive. For a long time, the big sign they have at the corner of their lot showing the days price for regular 87 octane gas listed the cash price, but they changed it to the credit price and said six cents off when you pay with cash. When I asked the employees about this change, one told me that had received complaints about the advertised price being incorrect, and had received at least one threat of a complaint to our AG. In such a situation, what do you think the right price is to put on the big daily price sign? Cash or credit? It seems to me that cash is more accurate and perfectly valid and that the price discrepancy is an upcharge for the use of the charge card. But then more people do use their credit cards in paying for gas than cash. More generally, what do you think about merchants that offer different rates for cash versus credit card purchases? Have you ever tried to negotiate a lower price based on payment in cash instead via credit card (or check)?