Yeah that's still gonna be better than my v6 Chevy! I figure if I'm pulling at higher rpm's all the time my smaller engine is working hard to move my trailer. I think if I had a bigger engine I could burn less fuel with it by not working as hard. As for the 04' its just got intake/exhaust, a programmer and stacked chip. I believe its a Diesel Dr. and an edge.
I guess I will have to wait and see once I get one (looking at an 06' Cummins). I'll keep you posted.
Oh and sorry for getting this thread side tracked and off topic, as I am not a Dodge owner yet lol.