EL DORADO, Ark.--(BUSINESS WIRE)--Murphy USA Inc. (NYSE: MUSA) is pleased to announce that the Board of Directors has appointed Michael G. Kulp as an independent director of the company. "We are honored to add Mike to our Board,†said Madison Murphy, Chairman of Murphy USA Inc. "His extensive experience in retail food service operations, combined with his proven leadership in scaling multi-unit businesses, will bring valuable insights as we continue to strengthen our operational excellence and. ...