They were not using 100 Octane at least by the log entry posted in this thread.
Quote:
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combined figure for 100 and 87 octane fuel.
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The footnotes would point that out.
Clearly, 87 Octane is the only aviation fuel available before June 1940.
Once again, this is reflected in the Operating Instructions as well.
If 100 grade was the standard, it would be the standard in the Operating Instructions.