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mine is a job 1 08 2wd dually with 4.10 (36K).
normal unloaded mpg: 14-15mpg
towing 20-25k lbs gcw 70-75mph: 8-9mpg
surprisingly enough my loaded 6.4L fuel mileage is usually within 1mpg of my 6.0L and 7.3L in similar towing conditions. my 6.4 has sooty black tail pipes and doesnt regen nearly as much as everybody elses trucks do. Ford doesn't care about the black tail pipes (two different dealers). On a recent 1,200 miles trip towing 25k lbs, the truck only went thru 2 complete regens.
unloaded my 6.0 and 7.3 get about 16-18 with a 3.73 rear end.
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2003 Excusion 6.0L 3.73: Stock
2004 F-350 6.0L 3.73 Dually: Silverline cat back exhaust, CFM+ intake elbow, Isspro gauges, trans tuned by Innovative.
2008 F-350 6.4L 4.10 Dually
2011 F-350 6.7L 3.73 Dually
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