I have the Max tow with the 3.73. I have only saw around 20 at 60 mph it drops to about 17 at 75. I do only have 1300 miles so I am hoping as the engine loosens up it may improve. I got the 3.73 for more pulling power so I am fine with that If I wanted better I would have opted for the 3.55. I can pull my 2000# boat and still get better mileage than my former Durango empty so I am happy about that. But what is impressive is the pulling power. Last weekend I pulled my 7000# travel trailer and hardly even knew it was there. At 60 I still got over 10 mpg that is what I was impressed about! This engine rocks! Before I ordered I wanted the 6.2l but they didn't offer it in the xlt. After owning I am happy to say the least.