I honestly can't think of the last time I've seen a gas station that only sells gas or diesel. At least around here, they just don't exist. The "gas station" is the convenience store around here. I doubt their patronage would drop off much if they stopped selling gas.

Gas stations around here sell anything from the usual cigaretter, pop & snacks to really good "home made" food. I can think of one that had a small, very good, Mexican restaurant in the back and another that made gyros, falafel, etc. to order. I would go out of my way to stop at those.

But gas only? I simply can't remember seeing one in the last 10 years. The closest is the ones that are service stations that happen to have a few gas pumps.