"John" wrote:
So, what is magic about the 1350 degree sea-level full rich takeoff
temp? Can anyone suggest any good reasons why it is not equally safe
to lean to operate at the 1450 degree conditon during climb?

The EGT isn't what matters; it's the CHT's that are important. As long as
they don't get too high, go ahead and lean as you climb. I have an engine
analyzer that I watch while I climb, using whatever mixture setting I need
to keep the hottest cylinder below 400 deg, F.

If 1450
degrees is good for hours and hours of continuous operation at cruise,
and if cylinder temps are green, why needlessly expend more scarce
fossil fuel operating at 1350 degrees?

No reason at all, IMO.

Won't the engine also develop
more power at 1450 degrees than at 1350, which seems quite worthwhile
for a number of reasons?

Yep.

I'm not trying to be contentious, just
wondering if anyone has ideas about it that I haven't considered.

I think you've got it covered.
--
Dan
C172RG at BFM