It seems curious that a number of people in different areas have seen a drop in mileage. I wonder if it has something to do with the quality of fuel available right now. I have a 2007 with the 6.7 and routinely get 17 to 18 around town and 20 plus out on the road. I have noticed my mileage drop while pulling my 5th wheel and thought I neede to change the fuel filter. By the way Dodge has re-designed the fuel filter so that the inner element can be replaced seperately, but the price of the unit has gone up.

Mark