Cenex in Bismarck, ND on Centennial Rd. is not honoring their own coupon for fuel discounts. They had a lower level clerk assure me, before I loaded up, their coupon for $ 0.08/gal of gas would also cover diesel fuel for the motorhome. The coupon was in the Local KOA brochure. I filled up and went inside. Then the manager appeared and told me the coupon was for gasoline only, not diesel fuel, and she would not honor it.