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So far the only reliable way to get better mileage is to slow down and drive the thing like a 80 yr old lady. OR toss your warranty out the window and do a EGR/DPF/DOC delete and use a programmer to disable the regen cycle.
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08 F250 CC SRW SWB 4x4 6.4L PSD
Thirstiest damn diesel I have ever owned.
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