I mean, I understand that there is more carbon buildup at a lowered temperature, but:

A. Carbon buildup is a byproduct of any explosion, right? I know in firearms a significant amount of carbon is produced by the explosion. So isn't there technically going to be carbon building up in my combustion chamber, prechamber, and piston crown anyways? Isn't this what the principal behind the Italian tune-up is? Removal of carbon from injector tips, prechamber, etc, etc?
B. Wouldn't the engine wear less due to less metal expansion (less heat-less expansion) and thereby reduce friction?
C. Wouldn't loss of power due to lower combustion chamber temperatures be made up for by lower engine compartment temperatures leading to colder air intake and colder turbocharger meaning denser air packing?

__________________
"I would rather be ashes than dust!
I would rather that my spark should burn out in a brillaint blaze
than it should be stifled by dryrot.
I would rather be a superb meteor,
every atom of me in magnificent glow,
than a sleepy and permanent planet.
The proper function of man is to live, not to exist.
I shall not waste my days in trying to prolong them.
I shall use my time."

-Jack London 1876-1916

1983 300CDT (running WVO since 12/05)
1981 300SD (parts car)