08 6.4L bad mileage???? - Ford Powerstroke Diesel Forum
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Old 10-29-2011, 10:42 PM
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08 6.4L bad mileage????

Hey guys new on here and just bought 08 f350 drw 4x4. I love the truck so far but fuel mileage seems low. It has 95000 miles on it and i have put about 6000 of those on it. It will pull awesome put turbo seems to whine and fuel mileage is 7-9 when under a load. what should it be any suggestions on improvement? Truck is stock. Thanks for any help
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Old 10-29-2011, 11:46 PM
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Only options for improving fuel mileage that I know of is deleting the dpf and running a programmer. The dpf kills the fuel mileage on these trucks


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Old 10-29-2011, 11:59 PM
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You can clean the DPF I have heard every 100k or so it helps.
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Old 10-30-2011, 04:49 AM
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I'd do what they both said. Deleting the DPF on my friends 09 6.4 gave him almost 5 more mpg's on the highway. Also how many times does the truck go into regeneration where it burns off the soot and such in the DPF. There were complaints that on some 6.4 that it was happening all the time and some trucks even was stuck on regen killing fuel economy. I think it was a software issue. Then again on the flip side some people were shutting their trucks down before the regen was complete allowing it to become blocked.

Hard to say really without looking at it. Keeping the EGR valve nice and clean is a must. I check mine about every 10k miles or so. If your truck ever starts to lose power or fuel economy thats the first place I would look. Just keep in mind though that the 6.4 in stock form was a known fuel hog. Since you have a dually I will assume that you have 4.10 rears (although you may have 3.73's as well) in any case the higher the number on the rear the worse the FE will be.
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Old 10-30-2011, 04:53 AM
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One more thing, the 6.4 loves a good tuner. I'd get one that increases power and gives you a nice towing/FE setup. Bullydog has a nice one out and so do a few other. Some allow you to bypass both the EGR valve and the DPF on these trucks. Look into it.
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Old 10-30-2011, 08:06 AM
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thanks for all the ideas, I have been told to delete dpf. It doesn't regen to often. where is egr located so I can check and see if its clogged. running 4.10. thanks
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Old 10-30-2011, 08:21 AM
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Does anybody now a good powerstroke mechanic in Kansas City area
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Old 10-30-2011, 10:32 AM
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I have an 08 and do some heavy towing but never seen anything remotely that low. 7-9 seems like something else is wrong.
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