Guys the 100 oct justified itself whenn it comes to hve low alt extra power (short time) or increased fuel efficiency at low revs. That's why you see that kind of usage on the Blenheim.
It's not compatible with any highly charged eng usage untill the eng was specifically designed for (impeller etc...)
We hve alrdy say tht and this show that 100 oct usage by high flyng Spit makes no sense*.
Temp issue with the usage of that fuel were to be found even in 1945 with some latte war engines.
Moreover 100 oct costed twice as much as 87 oct fuel. This in pre-war doc. I think at today high soaring fuel cost you will easily imagine that this can draw attention of any war planners.
The only raison tht I see any large FC usage of 100oct is for a low alt air campaign such as to fight back to the sea any German ground force steping on English soil.
*Now the first Spits IIa reached Op unit in mid september if I do recall well. Those type being the only succeptible to hve an eng upgraded if ever they had.
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