My new 2020 2500HD Duramax only has 193 miles on it. 95% or more has been stop and go city driving and the computer is reading 9.8 mpg. I am sure it’s my driving as I am enjoying the torque! I will be taking it easy to see if I can get the 12 to 14 mpg city (Real world, calculated) I was getting on my 2016 Duramax.
My 2019 AT4 (picked up this week) is higher on the left. Very noticeable in the side view mirror- the body line on the cab is about 3/8” or so lower than the line on the bed.
Also the bed isn’t centered- the right side leading edge sticks out and the left side is in. Going back to the dealer soon to have them look at it.