He is technically correct, many to most gas stations are now independently owned & operated. Oil companies over the past few years have been selling them off to get their name away from them (yes the name is still on the sign but they can say not their fault).
Gas stations will basically buy from the cheapest place, but they each have the additive(s) dumped in them per specific station. Shell has their own, Chevron, etc.
So yes, many stations get the gas from a central location, but in the end the additives or lack of can quickly change the fuel.
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