Quote Originally Posted by larry_arizona View Post
For the record, Costco gas is top tier.
good to know but for a long time they didn't or couldn't advertise that. looks like around 2014 they received the designator.

here's the latest list of top tier. what I find interesting is this seems to cover the majority of the stations peddling gas today. doing some quick looking top tier is really a business that these retailers below "license" from. they are required to meet a certain detergent rate but can go up to 3x that required rate indicating that you might think chevron is the best but in reality quik trip might be selling a better blend. both are able to advertise the same. wonder how many other stations that are not top tier "certified" are really selling good gas but not willing to pay for the licensing fees since it's coming from the same wholesaler.

Top Tier Retailers
76, Aloha Petroleum, Amoco, ARCO, Beacon, BP, Breakaway, Break Time, Cenex, Chevron, CITGO, Conoco, Costco, CountryMark, Diamond Shamrock, Entec, Esso, Express Mart, Exxon, Fast Fuel, HFN, Hele, Holiday, Kwik Star, Irving, Kirkland Signature, Kwik Star, Kwik Trip, Marathon, Metro Petro, MFA, Mobil, Ohana Fuels, Phillips 66, PUMA, QT, Quik Trip, Road Ranger, Shamrock, Shell, Sinclair, Sunoco, SuperAmerica, SuperFuels, Texaco, Valero, Value America, Wow, and Win Win.