I have had my Dodge 6.7 dually for a year now. I pull a 40 ft gooseneck trailer everyday because i am a hotshot driver. I get 6-9 MPG depending on the load. Power is not near as good as the 5.9. Mine is in the shop right now for the 12th time and now they don't know what's wrong with it. My injectors already went out, wind noise is terrible and the motor light is always on. When I get it back I am going to see what they will give me on trade for a duramax. 6.7 is Junk!
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