Coincidentally, I am going on a long road trip tomorrow, and today I received a Smarty Jr J-06 diesel tuner. I did my research before ordering this, and am going outside to install it after I post this.
I own a 2003 Dodge 3500 Laramie quad cab with 8' bed, 4x2. I get 24 MPG without towing and 14 towing my 42' 5er. The engine is a Cummins 5.9 common rail
This tuner promises minimum additional 30hp in economy mode and 100hp added in performance mode. It also says it will improve my MPG in econ mode.
We shall see on this trip.
But I can say that pre-tuner, I can tow 70MPH on the flat, but it bogs down a little on mild hills. I want to eliminate that and be able to keep up with traffic.
A man can never have too much power