The testing had been done long before mass conversions began early in 1940.
http://www.wwiiaircraftperformance.o...t-approval.jpg
http://www.wwiiaircraftperformance.o...octanefuel.jpg
Then there is the document of Dec 1939 for stocking of 21 operation bases and 18 other bases with 100 octane fuel.
http://www.wwiiaircraftperformance.o...0oct-issue.jpg
Notice North Weald is one of those stations. How many times have we heard from you that no mods could be done without proper documentation/orders? So 611 Sqn must have done the conversion without proper authorization.
However did RAF FC conduct operations after Oct 1940 when 100 octane fuel was the fuel of FC as it still hadn't reached 800,000 reserve tons?
As can be seen there was no worries about 100 octane fuel,
http://www.spitfireperformance.com/1...e-2april40.jpg
Even at the end of 1941 there still wasn't a reserve of 800,000 tons.
We have yet to see the identity of these 16 fighter squadrons from you Eugene.