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Full intake and DPF back exhaust might, might pick up 0.5mpg. That is at least what I saw when I put on the S&B intake and 5" MBRP exhaust, but I'm already at 11-12mpg. When talking with the dealer they were real adimate about voiding the warrenty with just these upgrades. If you go that far the next step would be to tune the truck and remove the DPF. Take a look at the thread "Pics of my new trailer behind my rig" by SouthTexasDiesel, he states his milage, and it's better than yours.
Yea, but everything I have done for mileage and power will void my warranty if I bring it into the dealership like it is right now. I also ordered my truck specifically for mileage and towing, 6-speed tranny, 3.73's, etc.
I'll have that trailer loaded down this weekend with a 16,500 lb. packer. At best I'll be getting 10mpg.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.