Join Date: May 2013
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Terrible fuel mileage 05 6.0L
Here is what is done to my truck: h-11 studs, RCD EGR delete, brand new oil cooler, sinister coolant filter, s&b intake, 4" dual straight pipe, SCT livewire TS with looney wild from Vivian, blue spring upgrade.
PROBLEM: I only get about 13.5 mpg, usually less, with cruise set around 75 and only slightly hilly driving. I haven't had time to test injectors yet, but what else could it be?
I run T-6 full synthetic with archoil, and have a 4.5" lift with 35s.
I feel like I should get way better mileage than that. Any input would be great.