As a general rule I fill up wherever is most convenient. 93 octane gasoline does not vary much from one brand to another, and the difference in price from one station to another over 12 to 14 gallons is less than $2, which is worth less than the time and gas wasted looking for a cheaper price or waiting in line at Costco.
I do avoid both Citgo and Valero, since they are Venezuelan-owned, as well as BP (oil spill in the Gulf of Mexico).
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