Sure you can...
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based on a 1942 copy of a pilots notes
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I am sure there are other editions out there besides the January 1942 Operating Notes.
Remember, FC was accepting pilots from any branch of service to fill its shortages. Transitioning pilots would have started their journey studying the Flight Information Manual version of the Operating Notes.
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You calculate the dates from when the fuel was delivered
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No you can't....
You can only answer the question, "When did the RAF get fuel to all of its stations?"
The aircraft have to be modified. That modification is a major alteration that was scheduled to be done at Service Inspection. It is not something performed by the squadron maintenance personnel.
The parts have to be made to do the modification and parts have to be made to support current production as well as sustainment spares.
The only way to answer an operational question is with operational documentation. In this case, the document which details the operation of the aircraft is the Operating Notes. The portion that is a legal document connected to the airworthiness of the aircraft will reflect the latest authorization for
the type.
The statement "all Fighter Command was using 100 Octane July 1940" is not backed up by the facts.
The statement "100 Octane was used during the Battle of Britain" is correct and backed up by the facts.
It is clear that Fighter Command was in process of adopting the fuel but it is equally clear that process was not complete in July 1940. There is no agreement on the end dates for the Battle of Britain. So, depending on the dates one chooses for the battle to end, the process was or was not completed during the battle itself.