what mpg do you get on the lightweight

Weird. I was just told this morning 90 days for tnt and a year for psd. I hope they hook you up. I am going to call to verify in the am.

 

Once the winter blends go out your problem should solve itself. The past couple weeks the weather has been bad as well. For now you could try taking the cruise off and using the boost gauge only use what boost you need to and allow the truck to slow down some when it climbs. Are you in low speed limit zones like CA a lot? Having to hold it back down every hill kills the momentum going up, CA is murder on fuel mileage, 7's about where your gonna be in fully loaded in CA. Otherwise its not usual for a cascadia to be struggling to break 7, even out west. Are you not allowing the truck to coast downhill above 65, to keep the excessive overspeed warning from coming on? Let it roll up to the speed limit and never above 75.

 

I run 62mph all the time and average 7.8 loaded, 8.9 empty.