spark plugs, or "does something need to be fixed"

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
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Sounds completely normal. Worn with a light tan or gray color, no heavy deposits. Color of the threads is meaningless.

Not in the least. Whole different issue.

Seat of the pants acceleration sensations are very misleading.
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Isnt this usually gas cap related?
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RM v2.0 wrote:

It can be but from my experience the tank evap hoses and manifold are suspect.
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Suddenly, without warning, RM v2.0 exclaimed (28-Apr-07 12:38 AM):

Yes, but gas cap was replaced, and light reset. Was back on very quickly.
jmc
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jmc wrote:

I don't think so. The PO455 relates to pressure in your gas tank. It pumps fumes back to the engine rather than released to the atmosphere.
I had that issue about once a year on my 2001 Ram. Check all hoses leading away from the tank. First I had a split hose end. Then it had a crack on the plastic hose manifold at the canister. I don't believe it would cause any performance issues but if your state tests like here in AZ they will fail it if an emissions related code is present.
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