Does anyone know of a website or other resource that lists the oil company that provides gasoline to gas stations. We have several stations locally that I don't think are associated with the large oil companies. Some examples are Speedway, Gas America, McClure's. Of course, we have some of the major players as well, such as Marathon, Citgo, BP. Oddly, I haven't seen any Exxon stations. Is it possible their stations are under a different name?