I'm actually stumped as to where to start. I mean, you've ruled out two of the most prevalent producers. So let's look at Citgo.
They don't really drill, but they do refine, and then sell. So if they don't drill, where do they get the oil? From others that drill, and then transport from the location. Companies like BP, and Exxon. So Citgo is out. In fact, all the companies are out. You can't buy gas anywhere. Because they all buy and sell to one another. If the Citgo refinery has capacity, but is short of product, they'll buy from anyone. If Exxon doesn't have a tanker due in in time, they'll buy from BP to keep their plants moving. So you see the problem yes? Take a look at the trucks delivering the gas next time. They no longer say Standard, Chevron, Exxon, or whatever on the side. Because they are transporting from one location, to another. It doesn't even have to be Exxon Gas in the tanks at the Exxon gas station. The gas is what is important. That's why you don't see advertisements about how BP had the first tanker trucks rolling into the area ravaged by Hurricane Sandy. Because the trucks were local, the gas was shipped from somewhere, and divide up among all the customers, the local gas stations.
I might see the occasional Flying J tanker truck, but usually it's whomever has the local contract to distribute. Nobody cares where the gas comes from when they're filling their tanks up, they just care about the price, and if you are operating on a fixed budget, and intend to limit your purchases in such a way, then getting more for your dollars is the goal. Walmart, Enron, and Parkers locally have cards which knock a few cents a gallon off the price. Walmart is prepay, and just like all the other gas stations, get the gas from the same place as the rest.
Interesting point to consider, many cities, like Atlanta, get their gasoline pumped in by pipeline. Now, do you think that all the companies have separate pipelines? Or do you think that the companies all put gas in, and then get gas out of the same system? I doubt that Exxon, BP, Standard Oil, Citgo, and who knows how many others are all running individual pipelines for the use of their corporate locations.
BP and Exxon do a lot of drilling. Other companies, like Halliburton, do service and operational support. Enron does not drill and refine the oil to it's own standards. Citgo buys oil from anyone who will sell it. They refine oil to the various products for anyone who will buy the products. It isn't McDonalds and only official McD raw materials are used from approved suppliers. In fact, many regions have specific gasoline formulation requirements. Then there is winter and summer mix of gasoline.
So even if you drive past the BP station, and buy your gas from Citgo, you're still buying it from BP indirectly. My suggestion, get the best price you can, and burn as little as possible, so you can spend as little as possible.
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