I don't like the word detergent, let's call it an additive package. Contains octane boosters, detergents, preservatives, lubricants, etc.
If you were to go into a truck terminal you would see each different additive tank which is usually owned by the marketer. for instance, Shell will own the additive tank with V-tech additive in it. They loan it to the terminal as long as the terminal is selling their gas, and it becomes their gas when it gets the additive. The buyer (distributor's truck driver) buys what he wants off a selection of products. He is buying what he has orders for.
There are generic additive packages and some companies will allow their additives to be sold unbranded. So you may find Speedway has an agreement to add someone else's additive package to their raw gasoline. I don't know.
As others have correctly said, don't worry about additives when you're traveling. Several tankfuls of gasoline with a weaker additive package are not going to do harm to your engine. When you go back to the high priced spread you'll undo any issues you may have created. A good plan is to burn Speedway except for the first tank full in a particular calendar quarter. You don't need to burn the good stuff all the time.
I don't understand the AAA test but feel it does not give a true picture of engine longevity. I've never been bent out of shape over the top tier gasolines and routinely burn Murphy from Walmart as they are convenient and priced right. I also use QuikTrip but it is not convenient.
Our gasoline in Tulsa comes from our two Tulsa refineries (I was maintenance superintendent in one), Williams pipeline and Explorer pipeline, both from Houston. No telling who refined their gasoline but I'm sure Murphy gasoline is not from their El Dorado, AR refinery but it has the Murphy additive package. It is not a top tier package.
I have never had an engine problem, gasoline, oil or other related so I really don't know but have put a lot of miles on several cars. Some of my cars may have been carboned up at 250,000 miles but they ran and sold just fine. The bodies wear out first.
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