Correct me if im wrong, but i heard that Costco gas is Chevron gas. The company that drops the gas off is a sub company of Chevron.
I always use Shell becuase its in the same parking lot where i work and the price is really good compared to other gas stations across the street etc.
I always use Shell becuase its in the same parking lot where i work and the price is really good compared to other gas stations across the street etc.