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HyVee grocery stores have a great recurring promotion at least every other week it seems. If you purchase at least a set amount of groceries (usually around $60 to $100) you then get 30 cents per gallon off the price at their gas station. Sometimes the set amount is specific to particular products and sometimes the amount you get off the regular price changes but I've gotten up to 85 cents per gallon off the stated price when I filled up. I can remember one time I still had a half tank of gas but filled up the rest of the tank for $3.51 total.