I have the GMC version truck ordered March 2020 and delivered October 2020. The first 1000 miles were short trips of less than 2 miles with a couple 15 mile trips and got 20.2 MPG. One week of sub zero temps, truck started without engine block heater. I did let the truck warm at idle for 3-5 minutes before I started to drive.
Two trips one south thru NYC area to DE and averaged 34.5 MPG and a trip north to Maine 32.2 MPG. Both trips traffic was moving 70+ so we stayed with the flow.
It is giving me the mileage I was hoping to get when I bought it.
One dealer visit for engine light. Exhaust cleaner light would come on, but I would shut the truck down at the end of my local trip. I was told to keep the engine running the next time until the warning message goes off.
