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I assume the engine preasure is to high to a long time. Keep it to max 1.25 ATA (so says the manual) while travelling.
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Not sure if that works while climbing though. ATA is (AFAIK), an instrument measuring pressure, kind of like the manifold instrument on Allied aircraft.
As the air gets thinner the higher you go, and as your engine needs air to breath to work efficiently, you will lose power the higher you go.
BUT there were these things called superchargers, which gave the engine extra boost at high altitude.
The 109E had an absolute service ceiling of around 32,000ft (9,700m), and I guess performance was pretty sloppy that high, but you should be able to get to around 20,000ft (6000m) before performance starts dropping off noticeably.
Here is a link to British evaluation tests of captured 109Es:
http://kurfurst.org/Tactical_trials/...ls/Morgan.html
The first graph shows climb performance.