Not sure how it will be with the "baby" diesel, but on my Cummins ('16 Ram 2500), it all depends on how much I'm using the turbo. When I'm empty, I can go about 5k miles. When pulling the 5th wheel, about 1k is all I'll get. Sometimes, if hilly, less than that when pulling.

"Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same." - Ronald Reagan