Owners manual info GMC
I bought a 2018 GMC 2500 dsl a couple days ago and today was reading the owners manual. In it about towing it said not to use tow/haul unless you were at 75% or more of gcwr. It said it was of no bene...
Forum Discussion
Rover_Bill wrote:
It is my understanding that Tow/Haul mode keeps (or delays) your computer controlled transmission from up-shifting into the top-most gear when on the highway, delays (or slows) up-shifting in the lower gears when in stop-an-go traffic, and reduces gear hunting when driving in hilly terrain. All of these have a negative effect on your fuel mileage when not actually hauling a load and therefore not recommended in the owners manual.
The OP is talking about never using Tow / Haul, even when towing. :R Contrary to what the OP claimed, GM's position is that using Tow / Haul is beneficial if you're towing at 75% or greater of the vehicle's GCWR, not it's GVWR as the OP claimed. Heck, I'm towing a small 19' travel trailer that on average weighs ~ 4800 lbs loaded & ready to camp yet once I plug the numbers into my towing calculator it tells me that I'm towing at an average 74.15% of my Silverado's GCWR. If I were towing a popup I'd not bother but since I'm not I use Tow / Haul every time I tow our travel trailer. ;)
