Tow haul button

chevor wrote:

n7bsn wrote:
I would suggest you read the manual, they are actually quite clear about when they recommend to use it

But no, they don't help MPG, for example, down hill they can force the vehicle into a lower gear (engine braking) which consumes more fuel

How do you consume more fuel downhill in a lower gear?

I use mine under 50 mph pulling and when slowing down empty and pulling. I like to be in overdrive gears as fast as possible.

I have the answer for that, at least in my case.

I only tow about 7K so I'm WAY under gross for my truck. When I have TH on when descending hills I may want to go down the hill at lets say 60 MPH. If I tap my brake, even for an instant, it will downshift and put the turbo into full retard which takes me from 60 MPH to 50+. Then if I tap my brake again it will take me to 40. Then I have to "add fuel" to take me up to 60 again.

I get to 60 MPH and then I have to tap my brake for a tiny curve in the road and then the whole thing starts over again. if this happens a few dozen times it gets super annoying and adds quite a bit to fuel costs not to mention the tranny gets shifter a whole lot more.

OP if you're looking for fuel mileage TH is not the way to do this. In your manual it will state the recommendation of when GM "recommends" you use this feature. I'm under the weight of recommendation so most of the time it's off on my truck even, while towing.