100 LL has FOUR TIMES the amount of lead that my engine was designed to
run with. As a result, spark plugs foul with lead far easier, making
it necessary to aggressively lean the engine. Which, of course, in
turn leads to much higher exhaust gas temperatures, and unnecessary
wear and tear on the engine.


Geez Jay, better get yourself educated on leaning. Leaning properly on
the ground means way, way lean of peak which by definition is downright
cold EGT's although on the ground at low power there's no such thing as
high EGT. You need to familiarize yourself with the red box when it
comes to leaning. Done properly the EGT's are as cool or cooler than
rich of peak and the CHT's are significantly cooler. An example is that
about the worst place to run your engine while at 75% would be 60-80
degrees rich of peak.