Wawa is a chain of large convenience stores, mostly in the Mid-Atlantic region. They typically have a sandwich counter inside, which I think is most comparable to having an in-store Subway.
Ask someone from Pennsylvania or New Jersey what they think of Wawa. In my experience, their eyes generally light up and they start raving in a way that most people don't talk about a gas station convenience store.
It's because they have real food, whereas most gas station convenience stores only sell junk.
24 hours a day, you can get hot soup, quesadillas, sandwiches, salads, burritos, etc. in a matter of minutes for a reasonable price. There's really nothing else like it.