Join Date: Dec 2010
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I got my 2008 6.4 used with 27,000 miles on it. With the 6-speed manual I was getting 16.7 mpg highway hand calculated... I experimented with speed a little bit. If I keep it under 60 with the 3.55 gears, I was getting around 17-18 calc, with the meter telling me around 20-22. If I hammer on it and go 70-75 I was getting closer to 15.
Overall on longer round trips I am still averaging about 16.7 by hand. Doesn't really seem to matter how delicate I am with the skinny pedal. My round trip has alot of elevation changes in western PA.
I need to do some experiementing with a Tonnue and a DPF/EGR delete and see if it shows any improvement. After that maybe we can see what a hotter tune might produce.
At present this thing is bone-stock other than the DPF back 4" stainless exhuast.
As far as mileage is concerned, I am impressed with the truck. Truck weighed out at 7800 lbs on the scales at work... And I used to drive a 3.0l V6 Ranger where I was getting about 21-22 MPG... Needless to say that isnt a bad drop in MPG for a significantly larger truck.