Regular gas is regular gas.
I used to do environmental consulting for various bulk petroleum terminals. I'd be at a Gulf terminal, and see other station trucks come to get their fuel. They don't store a Gulf gasoline and a Mobil gasoline; they just store 87 octane, 89 octane, etc. In fact, some locations only store a high and a low grade, and do a blend when delivering it to the tanker truck.
Upper grades sometimes receive different additives that also get mixed in on delivery to the trucks, but the gasoline itself is the same.
Now, it is possible that the Shell station down on your corner has some crap mixed into their storage tanks, but that isn't a problem with Shell, it's with that specific location.
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