Jarret,
I was running unloaded on both trips last weekend. On Sunday I took a trip up & over Stevens to Wenatchee, and then back home via North Cascades Hwy. Great drive, lotsof good scenery. But here's the best part... I went over 3 passes: Stevens (4,000'), Washington (5,500'), and Rainy (4,800'). All have pretty steep grades, especially heading West on Hwy 20 up to Washington Pass. My mileage for this trip was an astounding 24. 4 MPG. I didn't baby it either.

Only problem I encountered, was the thin air made my DD3/PE EZ combination run hot. No smoke, just high EGT's. Guess it's time for a turbine housing.

One thing is for sure though--I gotta get my exhaust brake installation finished. WOuld have been nice to have that on the downgrades.
Main reason for my Cascade jaunt on Sunday was to check out the BNSF Cascade Sub. I dunno if I mentioned it before, but I am an avid railfan. All the more reason to find a place up in Skykomish, or the surrounding area.
One of these days, we'll have to meet up and have a bull session.
About your paint problem... May want to take it to a professional automotive paint shop, and have them do dome kind of high-heat finish on the rear quarter area where the exhaust is. Something with a tough, non-porous clear coat would be ideal.
As to the miles on my truck, I am at 48,500 in 14 months.

Will be turning 50K real soon, within the next week or so. My guess, is by this time next year, I'll be near 100K. Monumental event! How many are on your odometer?
Not sure if you are interested or not, but a few of us are going up to BC for some diesel drags on Saturday. Interested?
Catch you later!
--Evan