The Aeroplane for 10 Dec 1948 says the Blackbushe FIDO cost 125 pounds (sterling, not avoirdupois) per minute, after it had warmed up; the issue for 3 January 1947 says fuel for the Manston FIDO cost 15000 pounds per hour. Articles in Flight: 6 March 1947 p193, 13 May 1948, 21 Nov 1952 p634, 28 Nov 1952 p670.
Flight 3 March 1949 says the LAX FIDO was complete, 6000 feet long: American Aviation says it started 2000 feet short of the end of the runway and burned 1750 gallons per minute of No 2 diesel fuel.