I'd wait until the warranty is up before you modify the truck. Honesty, if you want better mileage, slow down a bit and ensure your tires are inflated to the correct presure.
2008 Dodge Ram 3500 6.7 Mega Cab 4x4 SRW Laramie - Big & Black
Full delete, Torque Technolgies programmer, Sinister EGR delete
Hijacker Auto Slide/ P3
2006 Triple E Topaz 310RBXL
Wife, 2 kids (Murphy the dog - RIP friend)