Spit IIa is now so much more inferior to the 109

[NZtyphoon]

Originally Posted by Crumpp

Let's see the whole publication because they do not match at all. Either the warning about 100 Octane is a technical update added at a later time or it is not from the same document.

The 1937 Training Manual makes no such distinction about 100 Octane fuel.

Yup and let's see your 1937 Training manual and the context in which it mentions boost over-ride, because so far we've seen nothing of it, just your description.