I can tell you an experience I had with a fast stop gas station, a few years ago, I made a trip to Atlanta GA. before I left I filled up at Hess gas station in Lenoir. I drove to Atlanta, and drove an additional 3 days around town. On my way back home, I stopped right out side the city of Atlanta. I filled up at a Fast Stop.(Now keep in mind, my Father has told me in the pass, to beware where I buy gas, because the quality of gas is different at low cost stations. He told me to stick with name brand stations like; Hess, Quality, Shell etc.., because I would not get the same miles per gallon.)
Well, I totally forgot about this story, until I
experience it. Fast stop gas only took me to Gaffney SC. and I was out. The Fast stop gas, didn't even get me close back to home.
So I have learn, not to buy the cheaper brand. In the long run, it cost me twice, almost three times as much. I looked into it and found the lower quality gas stations, have for a lack of better words, fillers, with-in the gas. This fills your tank and you vehicle will run on it, however, it causes the gas to burn hotter, which decreases you fuel mileage.
I have not bought gas at a fast stop since.
This is FYI, and hope you keep this in mind when you travel, and not have the same experience that I had.