Originally Posted by action1
Had a 2011 dodge dually 4x4 with the 6.7. It would not break 11 mpg with a light foot unloaded. iIt was stock and under warranty and did not want to remove DPF or anything else. It tow anything but it was way too nice to work out of and the milage should have been a lot better. Rode smoother than my ford f250 .
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it's the DPF and EGR systems that are killing it. i got rid of mine and get 18-20 unloaded