I know according to "Invasions Without Tears" page 199 by Monty Berger (RCAF), Senior Intel Officer of 127 (Spitfire) Wing, the 150 octane fuel was issued in early February 1945. At that time, 127 Wing was on the Continent with the rest of the RAF's 2nd Tactical Air Force.
My understanding is the 8th USAAF but not the 9th USAAF, used the 150 grade fuel.