Well, you can check for many planes handbook (notes for pilots).... it gives you the rpm and boost you have to use for usual flight phase (take off, sustained climb, cruise flight, combat power, emergency power, etc....)
These advices were not given for no purposes... they were given in order to assure that a plane engine will remain reliable during some times (and at least some flights)
If every pilots was using rpm 100% and boost 100% all the time, then there will be a high probability of engine failure at each mission.
The problem is that engine stress is hard to simulate, even during one flight session... and impossible for a plane life (since basically a plane flown by a simmer has no "memory" of previous flights and of the stress accumulated during its life.
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