We owned a convenience store for about 10 years. We were always the bad guy. Holding prices high even though the load in our tanks came in at a cheaper price. Raising prices just because our competitor raised his, not because our cost increased, etc. To be honest we were lucky to break even on fuel sales. Any money made was on inside sales. On average our margin was typically 5-6 cents a gallon. At that time gas averaged around $3.50. At 2.2% credit card fee we lost .02 cents for every gallon of gas we sold. On the rare instance that we were selling a cheaper load of fuel at the same price because our competition had not lowered prices yet we didn't feel guilty about it, we were just happy we weren't loosing money for a change.