if you had been dreaming of a gas station, it can mean several interpretations. A gas station is a place where you refill gas for your means of transport, and if it has a convenience store, you can also stock up on desire items.
If you’re used to shopping at a convenience store at a gas station, then visiting such a gas station can also mean you’re buying some groceries, or cigarettes if you smoke. This is usual if the nearest “grocery store” is at the gas station.
The primary meaning of dreaming about a gas station is to buy fuel for your transport. Dreaming of a gas station means you’re buying gas for your vehicle because you’re traveling and need to stock up. The dream interpretation is that you’re going traveling.