Circle K
In 2018, in specifically the states of Illinois and Missouri, Circle K rebranded many Top Tier fuels (Shell, Phillips 66, Exxon, etc.) to the Circle K brand. Circle K, though when co-franchising with major Top Tier fuel brands, such as Shell or Phillips 66 for example, did sell Top Tier fuel, it currently no longer sells Top Tier fuel at any location that is a Circle K exclusively convenience store and gas station. Circle K has parted ways with the vast majority of it's co-franchised brands, that were Top Tier fuels. Circle K was officially removed from the Top Tier certified retail brands list in 2019. Circle K fuel is definitively the same quality of gasoline that Walmart, Sam's Club, Kroger, Murphy USA sell to name a few major chains, and is NOT a Top Tier Fuel, as of July 2021.