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Pump may matter more than brand
The mixing pumps may be a factor, especially at a station that is selling a lower grade than the one you are buying. The idea is that a bit of that moonshine the last guy was pumping might make it into your ultra dinosaur blood and effect your mileage slightly. If you're buying premium, it's probably better to do it at a station that has separate hoses, if you are buying moonshine, it's probably better to use the fancy electronic pump in the fancy neighborhood.
If driving a mile out of the way for a penny in price costs more, I imagine it'd be the same for the marginal gains between brands.
Personally I avoid Freedom stations because of the Koch brothers, BP for the gulf spill and the revolutionary war, and Exxon for the Valdez. Hopefully I'll be off gas by the time everyone has appealed to my irrationality.
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