Yes, it may be drifting, but I'm still unconvinced. Why should they model the boost cutout without the little bleeding valves? It makes no sense whatsoever except for seeing the engine blow up.
I'm quite convinced that the RAF runs on 100oct fuel; however, the boost control cutout seems to be non-working in the Spit MKI. I just flew the MkIa (i think) and there, boost control works as it is described in the pilot notes. Well, I can't be 100% sure because the gauge ends at 8psi, but I'm convinced it provides the advertised 12 psi.
On a side note: I don't consider the fine pencil lines that seem to be erased out (perhaps he wanted to draw another diagram for a different plane at first) as relevant. The red line is max throttle and the blue line is "boost cutout engaged". It's named "all out", after all.
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