Keep in mind, for the larger engines, that a standard EGT probe may not be optimally placed and there is a risk that the gauge may, in fact, get the pilot into an undesirable situation. I suspect that the only comfortable way to get back to best burn with a large engine is if the installation is a little more complex and each cylinder in monitored individually.
At the end of the day, is it so important to save that extra dollar of avgas cost as a proportion of the total cost ? Would one be better running a little richer for comfort (so long as the fuel flow gauging is reliable) when considering the potential for engine damage ?
I note that a recent accident in Australia has raised this sort of consideration to a topical level ....
[ 05 January 2002: Message edited by: john_tullamarine ]</p>