I am sure this has been discussed before, but who uses it and how? I have a 1 ton diesel dually and will be towing a 5500 lb (dry) trailer. I am assuming it will lower fuel economy? Am I correct in as...
From my understanding (which may be flawed), it does not decrease fuel milage. It changes the shift points to shift at a higher RPM to prevent transmission hunting. It also allows for more aggressive down-shifting when going down hill.
Anytime I'm towing, I use the T/H button. However, most of my driving involves mountain grades.