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That's the truck of my dreams right there. The 2003-2004 had the common rail engine, but lacked the DPF, cat and all that other garbage. Good taste in both trucks and bikes (see my garage)!
I've got 3.54 gearing on my 1998.5 Cummins 4x4 and achieved 22 MPG at 65 MPH on my last trip. That's with an automatic tranny that is in terrible need of a rebuild, and a very sloppy front end that required 30 degrees of constant steering just to go straight. 1600 RPM is a good sweet spot for that motor, and I was probably at 2 or 3 PSI of boost the duration of the trip.
If you don't need the traction, get road tires. They will be much more fuel efficient and quieter.
I've had several brake calipers either seize or allow air into the lines. Don't know why the calipers are so problematic, so check them often.
Get a bed cover to improve aero. Agree with all the other suggestions on here. 20 MPG is doable, but you'll probably need a gearing change.
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