This is not a 100 octane thread, but FYI:
According to documents I have copies of from the PRO in Kent, at the end of June, 1940 the RAF had:
336,000 tons of 100 Octane
270,000 tons of 87 Octane
so, about 55% of aviation fuel stocks were 100 octane. In addition:
End of August 1940: 64% of stocks were 100 octane
End of Sept 1940: 64%
End of Oct 1940: 64%
End of Nov 1940: 63%
... with the total tonnage of both fuels increasing about 30,000 to 40,000 tons a month. All this right in the middle of the BoB. Not only were 100 octane stocks consumed through combat and wastage being replaced, stocks were increasing by 15,000 tons a month.
The reason so much 87 octane is consumed during the BoB is that all training activities used 87 (including Spitfires and Hurricanes used in training), as well as transports, etc. Also, I believe the RAF ground vehicles were all using 87 octane from the same aviation stocks.
Whenever Spits or Hurricanes modified for 100 octane were fueled with 87 octane, the ground crew inserted a locking pin in the boost cutout to prevent the throttle being pushed into the WEP zone. I think that came from a copy of a maintenance manual I have.
For some odd-ball reason all flight sim developers appear to ignore the +12 boost advantage that 100 octane fuel and the CS propeller gave both the Spitfire and Hurricane. I'm not sure why this is, but it is. It appears this is the same for this sim (I don't have a copy of it.)
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