Originally Posted by hankwedge
Downhill? I can't break 4.8 with my tuner
I didnt get to the 4.6 territory until I had over 4K miles on the truck AND the temps here dropped down in the 70's and 80's. Your truck new Hank?
.2 isnt much. It could be that you are power braking it a tad too much or shifting a little late etc, etc
Try a run with your foot completely off of the brake.