So far I can't find any information regarding my question. Pretty recently I learned that when it comes to US Air Forces the 8th Air Force was the only one that used 150 octane fuel and I'm trying to figure out how common it was for a German pilot to encounter another fighter running on 150 octane fuel. To my knowledge it was very common in 8th Air Force but I don't know how many fighters above Europe were part of the 8th Air Force since I can't find any numbers.