Mpg 2019 cascadia dd15 dt tans

What speed/rpm

 

I’m at 6.7 30k 70mph 1550 rpm’s, 22.5 tires, 2.64 gears.

Drag meaning maybe one of your brakes is to tight or not fully disengaging.

Next time you do a long run check your hub temps, that could be an issue as well.

 

70mph not sure exact rpm 1300?

 

Will do. I have a pm scheduled for next Monday hopefully new filters help out too. I check my hubs every time I fill up and keep a watch on the dash nothing out of ordinary on the truck. I have noticed that the slack adjusters might be a bit worn on the trailer.