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The refineries process all they can. They will supply everyone they have a contract with first from their facilities. This includes the refineries and tank farms they own. Then their excess stock is sent to a spot market. All refineries will do this with any excess to sell and distribute their products. (note: this is not finished products, but raw gasoline stock). It's for the money.
If a Shell station in *$*^%# in the state of &%^$@# that does not have a refinery within delivery range, their suppliers order from the spot market. If the supplier has orders from their corporate contract saying anything for a Shell facility supplied, it will be blended to this specific blend before shipping. Every company has their individual blends, including cleaners.
I've only seen the requirements once about 15 to 17 years ago and they were so so very close to each other. But the base stock was all the same product.
I haven't heard from friends that anything has changed.
They're more similar then they want you to believe.
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