Between 4 May and 17 July she ferried oil on the east coast, loading at Aruba, Netherlands West Indies, and Port Arthur, Texas, and discharging her cargo at Bermuda, Argentia, Newfoundland and Norfolk.

A series of runs between Aruba and New York, then to Guantánamo Bay and Bermuda, and later to Argentia occupied Chiwawa until 31 May 1945, when she entered Norfolk Navy Yard for overhaul until 1 July.

Five days later she sailed for Ulithi and Okinawa, where from 30 August to 29 November she served as station tanker, making one voyage in September to fuel the U.S. 7th Fleet at sea.

She sailed 19 January 1946 from Melville, Rhode Island, for ports in England, Germany, and France, called at Casco Bay and Argentia, and put back to Iceland before her arrival in New York 18 March.

Now owned by Interlake Steamship Company, MV Lee A. Tregurtha had her steam turbine replaced with two 3000 kW (4050 HP) Rolls-Royce Bergen B32:40-L6A diesel engines during the 2005-2006 lay-up.