Rattle around at will, but the definate case is that the 150 oct fuel for the RAF was in 1944/1945 widely available, while the LW was down to pulling their macines around the ramp with oxen, just to save fuel. (guess they ate them afterwards, hehe)
Need to keep in mind that the Germans were in all likelihood using C3 fuel which was the equivalent of allied 100/150.
In 1943, the few C3 samples the allies' tested were showing greater than 125 weak mixture knock rating. In fact C3 fuel from a 1941 sample easily gave 140 weak mixture knock rating after hydroforming, the process the Germans were using and developed.
Now the report is far from conclusive as the allies never gained enough C3 fuel to adequately test much less use in test flights of captured aircraft. So based on this report it is impossible to say "all C3 fuel was...".
Just like the allies, it is probably a safe assumption that the Germans broke their fuel production down according to end users. In other words, Ju88's received a different quality of C3 than FW-190A fighter units.
What is certain is that different grades of C3 fuel existed and were used.
This report is dated June '44:
All the best,
Crumpp
