Andrewr just one question. Have you ever been to an APS seminar?
No I haven't. And they probably don't want me, because I would keep interrupting with questions every time they said something questionable. For example:
"Peak EGT is the worst place to run your engine."
Why?
Every mixture vs fuel efficiency chart shows peak EGT corresponds very closely to mixture for best efficiency. If the engine designer cares about fuel efficiency, this is exactly where he wants the engine to run in cruise. If the engine manufacturer says you can run there in cruise why would you doubt them?
"But the heat..."
Engines are designed to burn fuel and get hot. It's what they do. As long as the cooling is adequate you will be fine. And if the engine gets too hot running at the settings it was designed for, you have a cooling problem.
"But it will last longer if it's cooler..."
Evidence please. How much longer? How did you measure it?