I own a 2002 Chevy Duramax 4x4 ext cab 60,000 miles on her and was thinking of trying a new Ford with the 6 liter diesel engine.It is a 4 door 4x4 short box, auto. 3.73, 2500 and was wondering what kind of mileage the Fords are getting towing and empty. I am only thinking about doing this because my Duramax sucks when towing my 8,000 lb. 5 th wheel. I am getting between 10 and 12 mpg no wind ,flat land, I have tried 60 mph up to 75 mph and it still sucks. How are the Fords? I took both the Ford and a couple of Dodges for a cruise today and must say I perfered the Ford. Thanks.