Thanks for the quick reply. The truck was originally tuned by Wade at Diesel Day Dreams in Thornton CO. Wade's towing tunes were 30 HP and 80 HP but I am not sure what he did on timing, supposedly everything kept very close to stock conditions. His program did change the transmission...
The Ferman, couple of edits on my last reply. It does not come up yet where I can see it so I assume it has to meet the moderators approval prior to posting. The 'in drive fuel flow averages 18, and I think I said 14 (wife was hurrying me to go). I also have the basic Fass lift pump...
The Fermanat, thanks for the great information. Hope you see this and reply, sounds like you have a great handle on this. My 2006 3500 LBZ 100,000 miles, has new turbo, erg blockoff, 4" cat back exhaust, synthetic engine oil, has a second efi live tune specifically for improving towing...