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Generally its the emissions equipment on these trucks that kill mileage. I'd look into common emissions removal/bypass to start off. Of course you need to make sure you are staying legal for where ever you live.
Once your truck isn't as hindered by emissions equipment then I would look at better flowing intake and exhaust systems, and then see what tunes are availalb efor your tuner that focus on increasing mileage.
There are other traditional things that increase mileage, such as tire size and type, driving habits and so on.
Hopefully this gives you a place to start.
2001 F350 XLT 4x4 with the offroad package. Ext cab shortbox auto. 7.3 Powerstroke. TransGo shift kit, stock auto hubs, Napa 6637 air filter mod, no chips or tuners yet.