Look at the Spitfire II (a and b) Pilot Notes, page 13 (unbiased, first hand info):
http://www.zenoswarbirdvideos.com/Im...pit2Manual.pdf
100 octanes appear as a standard, 87 as the exception, 12 lbs boost allowed up to 5 minutes, but effective only up to
10'500 ft. At least for the Spitfire IIa and IIb. The source doesn't indicate the revision date though.
I didn't find the Spifire I Pilot Notes, unfortunately. I'll check my CoD collector's edition ...
