[jhann42]

I'm in the gas station business. Gas comes through the pipelines from the refiner to a tank farm. Different brands use the same pipe line. Tank farms will have different tanks for different brands. However, each of these brands will sell product to other brands or non-branded stations. The main difference between the gas you get from one gas station to another is the additive package which is added at the tank farm when the gas is loaded into the delivery truck. Drivers don't deal with the additives. These additives are what makes the difference between "top-tier" and "discount" gas. The only proprietary gas that I know of is BP's (Amoco) premium. A delivery truck should not deliver product to more than one brand with the same load. Octane is not the product of additives but refining. It comes through the pipe line with the proper octane.