6.7 mpg on DD15

I purchased brand new Cascadia 2015 with DD15,
I have drove 154,000 on this truck, and satisfied so far on MPG.
It's getting 7,5 - 8,0 per gallon with heavy loads 37,000+lbs
And 9,5 - 10,5 per gallon on light loads 7,000lbs - 15,000lbs
With driving speed 70-75 MPH

 

I have a 2016 DD15. Getting the same as Mr.P. Great engine. Very pleased.

 

2010.....that is a engine without DEF?

 

Also, it's depends on area where you're driving, lots of mountains, winds, or cold weather.
It'll definitely reduce your MPG.

 

Progressive shift plays a huge role in overall fuel economy.Add to that, sometimes cruise burns more fuel on hilly terrain buy dumping fuel to maintain speed during a climb. bottom line fuel mileage is determined by driving habits.

 

I even noticed my DEF tank last less in the winter (3,500miles)
And gets about (4,800miles) in summer.