Hey ziggy
I have a 2002 pos 7.3 2-wheel drive crew cab. I have done lots of mod to my truck like
- 6" inch lift with 35's BFG AT
-Supper lift trues speed
-K & N filter
- 4" exhaust from the turbo to the back with a 5" tip
- Supper chip programmer with boost and exhaust gages
- Rear air bags
- Tonneau cover for the bed
All this has gave me lots of performance improvements but no fuel savings that are really nosible.
Now diesel kleen is the shit! Its an additive that it increases your cetane and cleans your injectors and if you have smoke that takes care of that too. I went form 14 miles to 19 in the city and towing 12 to 16 now that gave me nosible fuel savings to talk about.