In a bone stock 2500HD how much weight can I safely haul around in the bed before I need to hit the Tow Haul button ?
I was under the impression the truck/tranny learns to shift different when in T/H mode, and won't my already bad fuel milage get worse in T/H all the time?
He said anytime you have a load or a trailer, not ALL the time. I also use T/H in both trucks with a load or a trailer.
Just curious why you say that you have bad fuel mileage. I am getting 16-17 city and 20-22 highway in my 2007.5 LMM. I was happy with that economy after driving my Chevrolet 5.3 liter gasser for 10 years. The Chevrolet 5.3 gasser got 15 city, 18 highway, and 10 pulling my boat.