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Yes I read that entire discussion and added my 2 cents several weeks ago.
Here's the bottom line:
A model IC engine burns fuel (glow or gas) to produce heat energy and converts heat energy into mechanical energy which turns the prop. If you have more nitro to get more power, this must create more heat for the engine to produce more mechanical energy. (Simple) The OS 1.20 will run well on 5% nitro. It will lose some RPMs and it will run at a lower cylinderhead temp (all other things being equal).
Regards
JC