G'day Chuck, Radar, et al...
Thanks for the responses.
Like many, I have been operating ROP by the '50deg method' EGT (only 1 EGT gauge) and checking against CHT / Oil for many years in many types...the precise economics of fuel / power was not of prime concern then - only the 'supposed' long term effect on the donk.
In my former 'full time' flying days I had no perceived probs with engines going full term between overhauls, and no 'specific probs' were brought to my attention.
However, I will always stand to be further educated, and will digest the many articles recommended and 'hone up' my techniques.
An excellent post!
Thanks again.