All gas is the same gas. Gas isn't shipped from the refineries to particular stations based on brand, it's simply added "to the network"... so Chevron puts 10,000 gallons into a tank one day in New Orleans, then pulls 10,000 gallons out from a tank in Sparks thus "shipping" 10k gallons in a minute.
The only difference between brands is the additives that are added to the gas shortly before it's delivered to a particular brand's gas station. So you might be getting "Chevron" gas at Costco, but it won't have Techron in it. Or Shell gas at Walmart w/o V-Power.
At least, that's how I've had it explained to me before.
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