 During that time, Humble also expanded the Enco brand to new marketing areas it entered for the first time, including the West Coast.In 1963, Humble was approached by Tidewater Oil Company, a major gasoline marketer along the eastern and western seaboards, to purchase Tidewater's refining and marketing operations on the west coast, a move that would have given Humble a large number of existing stations and a refinery in California, which was then the fastest-growing gasoline market.However, the U.S. Justice Department objected to Humble's plan and Tidewater's west coast operations were sold to Phillips Petroleum in 1966.