I'm UK based and its not easy to find the right time to call them so thought I might get some of your thoughts

Having just installed a new Bully Dog to my 2010 Cummins I am working out the system

What does installing the Transmission Tune do for it?

Also

I have "No Power" "Tow" "Power" and "Extreme"

Question is is No Power basically Factory Tune?

Secondly which fuel consumption read out do I believe?

While the BD displays 20mpg the vehicle itself displays circa 14mpg. I'm inclined to believe the vehicle display which makes me wonder where the BD is getting 20 from.

Car is very quick on extreme but I am very aware having read these pages that the gearboxes in these Rams are made of cheese.

Your thoughts are appreciated.