I can lean to that fuel flow without any undue engine sounds, too.
But my
EGTs go well over 1500 degrees, and my CHTs push 350 when I do.
I would rather burn a bit more gas. [...]

OK, but that brings into doubt your assertion about your fueling
style
being a big cost savings, doesn't it? Using 25% more fuel at 70% of
the cost per unit volume is only about a 10% savings. Or maybe you
didn't lean aggressively on avgas either?

Right -- I leaned no differently with avgas. A cooler running engine
will, all other things being equal, last longer.

I *can* lean a lot more, push my EGTs over 1500 degrees, push my CHTs
to 350+ degrees, save some gas -- and risk my new engine.

Now, of course, there are many theories on leaning (I've read 'em all),
but with my normally aspirated engine having such (relatively)
unbalanced fuel flow to each cylinder, I don't feel comfortable
aggressively leaning.

If I had fuel injected, balanced-flow GAMI-jectors, I'd be singing a
different tune.
--
Jay Honeck
Iowa City, IA
Pathfinder N56993
www.AlexisParkInn.com
"Your Aviation Destination"