With 2 different TT's, my 03 Ecursion with the 6.0 gets between 9.5 in the mountains and 12.5 on the flats no wind. I usually figure on 10.5 MPG as good rule of thumb.
The 6.0 is real fussy baout RPM and mileage. Keep the RPM's between 1800 and 1950 for best fuel mileage. Over 2000 RPM, the fuel mileage goes down and quickly.
Just my experiences with 2 different 6.0 diesels and towing.
Mike
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2006 F350 CC Dually 6.0 Powerstroke "the marshmallow"
2017 Montana 3710FL
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