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Can't remember if I saw it posted here or elsewhere, but Costco is now Top Tier gas. My H3 seems to be sensitive to lower quality gas and benefits from stations like Chevron. I avoided Costco previously based on the performance of my H3; only recently did Costco change their formulation to become Top Tier.
http://www.costco.com/kirkland-signature-gasoline.html
As our valued member, you expect Costco to always offer the finest quality products at the best possible price. Gasoline is no exception. Costco has closely studied fuel additives and engine deposits, and conducted extensive engine tests at nationally-recognized laboratories. As a result, we decided to increase the detergent additives in our fuel to provide a better value to our members. As of March 2014 Costco is listed as a TOP TIER™ gasoline retailer. Find out more attoptiergas.com/retailers.html.
http://www.costco.com/kirkland-signature-gasoline.html