Tow haul button

n7bsn wrote:
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

Er, not quite! When the engine is braking the fuel is cut off, ie NO fuel is being used at that point.
But in general I agree that Tow/Haul will not improve mpg, but it will help the transmission stay cooler.

When towing the travel trailer or large cattle trailer I use the tow/ haul mode, but when towing the boat or utility trailer with tractor I don't use it. It seams that I can make better fuel economy when not using the tow/haul mode.

I just find this to be an interesting question...with all the mods on your truck and fire power inside your rig that you list in your signature and you are asking about the function of the basic 'tow haul' feature...
Go figure.???

But, yes. Use the tow haul when you are towing. It changes the shift points, keeps the tranny cooler, and engages grade braking.

RV'ing...forget about mileage.

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

I use the tow haul any time i'm pulling my camper.