Who supplies pilot gas stations with their fuel?

Answer 1

All refineries, brand name or independent, manufacture the various grades of gas to meet an industry spec for that grade. This means that 87 octane is 87 octane, regardless of who made it. They then put it out in the national pipeline system for whoever to sell it. For example, if Shell puts a million barrels of regular gas into the pipeline in Houston, they then can take out a million barrels of the same grade in Chicago, Los Angeles or wherever. What gas they take out of the pipeline could have been refined by anybody, it's not the same gas they put in the pipeline. Some brands might put in a little additive or such as it is being distributed to their gas stations. Otherwise, it's just like buying aspirin - the cheapest is the best 'cause it's all the same.