Got my truck back from the mechanic, they did replace my sparks.  I
asked for one, as a learning tool.  Here's what it looks like:

The outside electrode is a pretty even gray, with just the slightest bit
of yellow speckling on one side.  The tip looks a tad narrower than the
rest.

The center electrode is grey, the top isn't flat- it's markedly angled
down toward the outside electrode.

The insulator is pretty much white/very very light brown speckled.
Along the top edge it's a yellowy brown.

There's barely any corrosion at all, anywhere, but both electrodes, to
my eyes, look worn.

The threads look a bit dark to my eyes as well.

According to the web page that was posted here a while back, and another
one I googled up, my engine's running a bit warm.  One site suggested
something about vaccum leaks (it was a bike site) - and indeed my truck
still throws a P0455 "Evaporative Emission System Leak Detected".  Could
these two issues be related?

Truck runs fine, but still seems to lack a bit of the the g-force
acceleration it used to have.

Thanks for any responses.  (and TGIF!)

jmc