Exxon or Shell 87. I'm surprised that Valero is no longer Top Tier. I know it used to be.
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At the local refinery all fuel no matter what station it goes to comes out of the same hose... All 87 octane comes from the 87 outlet at the refinery, and its a Chevron owned refinery. The driver (which I watched he is a friend and works for a fuel transport company) filled the tanks on his truck from one nozzle. Then he drives over to the additive tank and adds whatever station he goes to additives. And some stations get no additives he just delivers the fuel requested... So no matter what anyone thinks El cheapo gas and Chevron or Shell comes out of the same tank its just a matter of what gets added... And as far as additive goes to be honest its not much, about 5 gallons of 1000 gallons is additive... Then off to be delivered to the tanks in the ground of the gas station of your choice... But of course that's California and your experience at other refineries' are probably the same...