Circle K is offering 40 cents off gas on Thursday at participating locations in Washington to kick off Labor Day weekend. In a Wednesday press release, Circle K announced a major fuel discount to help customers soak up the final days of summer with one last adventure. The convenience store chain is offering up to 40 cents off per gallon of gasoline on Aug. 29 between 4 and 7 p.m. at participating locations throughout California, Oregon and Washington.