As far as I know:
In 1940 the Brits had a lot of 100 oct fuel. Engines were being cleared for it already in 1939. Actually a modified Mk I (production line aircraft) already cleared 400 mph emitting 2000 hp or so, however running on special "juices"
None the less, the Brits cleared several types for 100 octs, and even let some go as export.
Spits with CS 3 blade rotol airscrew were slightly slower than corse (sp?) 2 blade metal prop equipped ones, but however yealded a lot better climb and acceleration. A Spitfire Mk I model1939 already pulls more NM to alt then a 1940 Bf 109,BOTH running on 87 oct fuel.
In the BoB there were Spit I's from 2-blade wooden props on 87 octs up to Mk II's (and even cannon armed ones...ummm Rochford?) running on CS and 100 octs. A Spit II on 100 octs outperforms a 109E4 rather well in most categories while a MkI 87 octs w. 2-blade wood prop does not.
Summary:
In the time of the BoB there would be 109's around that outperformed the Spits in every category regarding speed, climb and acceleration, and also completely the other way around.
How about that?
