Dodge gas or diesel?

[gasman]

I have a 03 Hemi with 178k miles.
Tow my jeep and haul my camper with it since I bought it with 22k miles. 

Love it, mostly problem free, never left me stranded 


Lacking a little power on the passes when, towing loaded with my 9.5ft camper, but I'm completely satisfied.

Looking to get a new truck in the  next year and plan on a diesel,  but that's only because  I want the longevity of the diesel motor. Planning on making it my last truck for atleast 15 years or so. 

Mileage sucks on Hemi, 12 city, 14 Hwy, 9 towing 

[Mudman]

For comparison I have 05 cummins.  16-20 empty. I average around 18-19.  12-14 towing to eastern Wa.  Fully loaded bed with around 1000lbs+ and 27ft TT loaded with water and more stuff. Probably about 17-19k lbs GVW total.  MPG is better at 14 coming home, downhill and lighter.  I do have a heavy foot as well.