This happen last Thursday, I am a member of Mapco rewards and they awarded me 7 cents a gallon off so I cashed in some built up points to get another 10 cents of. but come to find out it don't work that way and I only got the 7 cents so after I got thru with my truck and climbed up in the back to put some in my transfer tank the pump shut off. So I asked the attendant why she cut me off I was not done and she said I must of laid the hose down and cuts it's self off but I did not and once it's off no more discount. so I paid for what I put in the truck and drove down the road for some red diesel got there and it was 15 cents higher than Mapcos regular price not counting the discount. since I needed to go into town anyway I rode by Walmart and for 1.89 a gallon that's 25 cents cheaper than the lowest price and worth the extra miles to get it I put 50 gallons in my transfer tank.