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Traditionally I buy Exxon gas because I own stock and do contract work for them. I'll do this only if their gas is in-line price-wise, and if not I'll occasionally veer to other brands. I live in Baton Rouge with a large refinery, along with several smaller Exxon chemical plants, and many of the off-brand merchants buy from Exxon. I see all kinds of trucks inside the plant, filling up for delivery to who knows where. Once I was at a Walmart/Sam's Club station when an unmarked truck was unloading, and I asked where the gas come from. He said, "Exxon." So, I can get my cheap gas and feel politically correct at the same time. I filled the SG at an Exxon station today and saw a truck unloading with "Lard Oil" on the side. Lard is a oil and gas distributor, and I'm sure that truck filled up at the Exxon refinery. I've heard from not-necessarily-reliable sources that nothing is sacred, and the majors exchange gas all the time, but I don't know how credible those claims are.
I don't really think it matters much, as all gas has FI-cleaning and other important additives, and I've never heard about any being superior over another. I haven't had a FI clog or other gas-related malfunction in about 25 years. I have no qualms about putting any name-brand gas in my vehicles with no concerns about quality, and even will sometimes buy from third-party merchants like Racetrak.
I use to think it mattered where. Then one day I saw something that changed my outlook. I always went to the 76 station by the house even though there was a privately owned station across the street that was 3-5 cents cheaper. Thought the 76 would be better gas. Then one day I saw an unmarked truck wrapping up from his delivery to 76 then drove across the street and set up to dump there. I do think the bigger companies are playing all of us because they can advertise and make us think their gas is better because we see it on TV everyday. Now I go wherever is cheaper and have yet to notice a difference in milage or performance.
There is a reason Exxon/Mobile just reported record profits.
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