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When I read about "quality gas" I have to chuckle. As one that delivered fuel to various station, I can tell you, no matter what the sign at the station, the gasoline comes from the same storage tank.
It's true that Shell did add an additive, but as the others, it was exactly the same. Oh, and the additive was only for he premium grade.
My advise, buy where it is cheapest, but never buy when you see a delivery being made. This stirs up the moisture in the tank and can get into the car's gas tank.
There is a new waterless coolant that will last longer than the car and will not corrode aluminum.