I have an 04 Excursion with 37's and 4:30 gears, I am running an XCal 2 and primarily run the Xtreme Street unless I'm towing then I run a Tow aggr tune. I am also running a 4" Banks exhaust, a Turbonetics intercooler, and a Fluidampr. Have very little puking a while back (Dec 06) and had studs put in with new gaskets here>
Head Gaskets and Studs Photo Gallery by Steve Orel at pbase.com
Depending on how heavy my foot is, I get 10.5 to 13 in town, 15.5 to 16.7 on the highway doing 75mph, and 8.5 to 12 towing at 60 to 70mph pulling about 10K. My Ex is also alot heavier than your truck.
My RPM's are:
1850 @ 65mph
2000 @ 70mph
2200 @ 75mph
2300 @ 80mph
