If 87 octane was still in use, proof should be easy to find. Can you find a dated picture of a Hurricane being refuelled with 87 octane fuel? I've seen such a picture for 100 octane fuel. Can you find a squadron record that documents changeover to 100 octane fuel in October 1940? I've seen such a document for April 1940.
Can you find a statement "not all operational fighter squadrons are using 100 octane fuel" in any document of that time?
I've been looking for exactly that, for some time now, and the more I look, the more I agree with Mr. Williams that all operational squadrons did indeed use 100 octane fuel. There simply is NO EVIDENCE AT ALL against that claim. This has also been confirmed in this topic by several people who appear to know more about the period than I do, while no-one objecting this conclusion as presented actual, factual evidence.
I'll keep on checking this topic for as long as it is going on, eventually, proof for 87 octane usage might pop up and I'll have learned something.
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