Just got back from a cross country trip with my F-250 6.4 and 9,700lb bumper pull travel trailer. California to North Carolina, then to Virginia, then to PA and back.Left April 27 got home June 8. Put on 7,045 miles. With the mods got between 12-13 MPG at 60 mph. Ran it for 1 day at 70 MPH down through Kansas and got 10-11 MPG. Truck ran great,(220K miles) used no oil or coolant, trailer not so good= bad tire and some other small fixable repairs...ran the mini max on mild for the best MPG's. tried all the other settings did not get the best MPG's. Just thought I would share this info.
Used Diesel Kleen most of trip, ran 1 tank with out. It does help..picked up 1 MPG with it

 

Do you have the DPF still? If so, that's great mileage considering.