2017 2500hd 6.0 gas up-grade questions

RobWNY wrote:
I have a 2015 2500HD with the 6.0 gasser. It has a love affair with gas stations. Got a whopping 6.7 MPG on average on our last trip. Have never seen the 8-10 MPG others claim to get while towing. I get anywhere from 9.3-9.7 MPG with nothing in tow! The Tow/Haul mode isn't all that wonderful either. Plenty of times, it's failed to downshift the engine after cresting a hill. Sometimes I'm a third of the way down the other side of the hill and the engine has failed to downshift and is still screaming. I've had a couple of instances when the LCD display didn't work and had a black screen so I had to adjust radio volume etc. from the steering wheel controls until I could stop, turn the truck off and then re-start it. Also the backup camera hasn't engaged the LCD screen a few times and I've had to put the truck in Park and then back into reverse to get it to work but other than that it has been an OK vehicle. Of Course, when brought in to have these issues checked out, nothing wrong can be found. In the end, it's an OK vehicle but nothing to write home about.

I have a 2015 GMC, double cab 8' bed with a Leer cab high cap. I have averaged between 13.8 and 16.8 on the 4 lane when not towing and between 7.9 and 9.8 towing a 6400ish trailer. That's in SW and central PA where nothing is flat. Sounds like you have something amiss somewhere to get those mileage numbers.

There is a software upgrade a dealer can flash that will correct the radio lockup and backup camera issues.