It had a (known) injector problem when I bought it from MSU, so I elected to be safe and replace the entire fuel system, including all injectors, both fuel pumps & filters. Also cleaned both fuel tanks, and had a compression check just to be sure (checked out perfect)! All parts used were MotorCraft/Ford. Additionally, I always run full-synthetic Shell Rotella 15-40W (diesel) T6 motor oil, and this truck requires 15 quarts!
For added fuel economy and towing capability, other improvements are AFE 4" straight-thru stainless steel exhaust system (with 24" straight-thru muffler), a 75-gallon, computer-controlled auxiliary fuel tank (with 38 gal primary for 113-gal total capacity!), giving us a 1,500+ mile range! Also added a Spartan Phalanx II Computer/Tuner for added versatility($1500). Additionally, I also added a 1500# capacity "Bedslide" so I didn't have to crawl in and out of the back of this thing when loading/unloading; I love it! It's kind of like a giant drawer in the back of your truck; works great!
I wanted this truck to look good and be super-reliable, so I also added 20" Cooper Discoverer AT3 tires and Ford custom wheels ($2500). Replaced all U-joints in driveline, and rebuilt front end components, including tie-rod ends and Track-bar, and added a heavy-duty Bilstein steering dampener. This truck, if bought today in it's exact configuration, has an MSRP of $57,000+, and the new ones require DEF additive regularly, which this 2009 model year does not.