My aircraft is an Emeraude built -59 I do not have a nice shiny POH to refer to.
I have been trying to find something on the net and have only come up with a generic engine management document for the C 90.
This document only says "lean above 5000ft" pretty much by revs/ear.
I run it on mogas and have had no problems for ten years.
I too was never taught to lean and have come to the conclusion that doing it by ear/trial and error is the only way that I can learn, or get someone to teach "his" version based on his experience.
People talking about damaging the engine by getting the procedure wrong is worrying to someone like me.
Fuel consumption I have discovered by trial and error has merely given me a set of figures based on fully rich. The flying budget tells me I should do better, reductions of 30% certainly seem attractive but not at the expense of a new engine if I screw it up.
Where does the likes of me go next, safely?