My first RAM was a 1990 W250 4x4, later traded for new 2002, new 2004, and now 2007. I haul a 12 foot 3500 pound slide in camper and tow 18 foot FLW bassboat. The fuel economy and power was unbelievably fantastic! Running empty 24 MPG. I tracked my MPG using a spreadsheet on my computers. I tracked my fishing holes, too! Fully loaded the camper was 3500 pounds sittin in the bed and the Bassboat was 6000 tow weigh. At 65 MPH I did between 20.5 and 21.7 MPG. The 2007 has been a big disappointment. My last long haul we averaged 8.8 MPG and running empty 14.6. When you hit a head wind out west you can expect a filter light on the pollution systems. All that power of the 6.7L and I couldn't use!