This may be old news to some - this is the first time we tried this. In our case, the local grocery store with its own gas stations is Giant Eagle, but other chains across the country are forming the same combos.

Anyhow, the Chase Freedom card is currently running a promotion this quarter giving 5x for gas purchases. This past weekend we went into the Giant Eagle GetGo gas station (which is a separate building adjacent to the grocery store) and purchased $100 in Giant Eagle gift cards. We then went over to the grocery store and did our weekly shopping with the gift cards. The clerk said that all credit card transactions at the gas station are list as "fuel station", so I am guessing that we will get 5x for our grocery purchases by using this method. Later in the summer the Freedom card will be giving 5x for grocery purchases, so we will reverse the process and buy gift cards from the grocery store to buy gas at the GetGo station.