Neal
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I have the 7.3 Crew 4x4 with the 3.55. After 1500 miles of mixed driving I am getting 12.64 MPG. That includes pulling a 6500 camper about 60 miles. I use a app called AUTOsist to keep track of my fuel and other things. For comparison my 2011 Silverado with the 5.3 and 6 speed (not sure what rear end gears were) averaged 15.78 after about 6000 miles of tracking. This is a flat land as I am on the coast.