2013 Ford F250, 6.7 Diesel, Suggestions to improve mileage.

Something seems wrong.

Lots of questions -

Have you owned this truck since new ? What did it get originally ?

If not, is this town mileage or highway ? Or a mix ?

How does it run ? No stumbles ? Good acceleration ?

I have 2013 4x4 dually CC long bed and I can get 20 or better on the highway. I get 11-12 towing 14,000 pounds.

Drive the truck for a half hour and then put your hand along the sides of the exhaust pipe tips. Don't touch it !!!! If it seems REALLY hot then it's stuck in regen mode.