Join Date: Aug 2010
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No shame for the Dodge owners here. I used to have a '00 Dodge 2500 5.9L Cummins, and it was a great truck. I used to get 23 mpg on the highway @ 65 MPH with +70 hp injectors and a boost module, if I could keep my foot off the pedal. The only way you'll get that kind of mileage on a F-250/F-350 6.4L is downhill. =)
I picked up a '08 F-350 Dually, 6.4L PSD, automatic, 4x4, 4.10 gears, crew cab, and long bed -- about as big as you can get. It turns 17-18 mpg on the highway, 14-15 mpg mixed around town. My truck has 82,000 miles on it, and runs like a top.
My ballpark estimate for 7000 lb trailer on level ground is is about 12 mpg highway.