Compression Ignition Addict
Join Date: Jul 2007
Location: North Beach Md
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You should already have better mileage in stock form then a gas truck.
I've got an '03 6.0, 174,600 on her, daily driver, 2.5" add-a-leafs and 33x12.5x16 Nitto's - I get 22 on the highway, 16 around town. My Superintendent has a F-150 super cab 4wd and gets like 11 around town and 15 on the highway. I've got a bigger and heavier truck and get better mileage then him!
if you get a tuner - it could help - IF you keep your foot out of it. More power = less down gearing = better mileage.
For the record - I dont have a tuner yet. Engine is stock except for the zoodad mod - which I cant say does anything really. I'm usually running with cab-height stake sides adding to the wind resistance too!
If you help the engine breath and exhaust with more flow - the benefit will be better mileage. How much is undecided as there is a broad range. But stock should get you around 20. Adding almost anything to it will help.