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We used to live a mile from a distribution station where the pipeline from TX is tapped and shunted to either a Marathon or Shell distribution station. Various tankers would go to one or the other, load up with gas and go to the various gas stations. After a major spill an article in the paper said that the raw stock from TX was generic. At the two farms additives were added, loaded into the various trucks and sent off. The blend in each truck was supposedly tailored to the customer, ie two trucks, one after the other, could have different mixes.
How true that story is, I can't say. How much difference the additive packages can make, I have no idea. Look for a petro/chemical engineer.
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