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Originally Posted by 41Sqn_Banks
Also I remembered that there are two different Pilot's Notes for the Spitfire II are circulating, one that mentions the use of 100 octane only and another that mentions 100 octane (operational) and 87 octane (non-operational). Wouldn't it be logical that the first issue only contains 100 octane use as the new Spitfire II was only used operational at first, and only later when non-operational units used it the handling of 87 octane is mentioned.
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Both are from June 1940 IIRC so any later amendments can be ruled out. In addition, Spitfire I pilot notes note 87 octane limits as well. I am haven't seen but its probably true for Hurricanes as well.