I tow a 7,500 pound TT with my 6.4L/3.73/4x4 and love it. Awesome truck.
I don't drive it a lot unloaded/unhitched (have an Accord for daily driving), but I think I probably get somewhere around 15 (not driving conservatively).
I was tailgating before the Colts/Bengals playoff game Sunday and several people wanted to talk to me about my truck. I'm starting to see more of them around.
Unrelated to the topic, but my wife got me WeatherTech floor mats for the truck as a Christmas gift. These things are great. Camping often means dirt, mud, and water, and these handle that way better than the the factory carpet mats. Only had them a couple of weeks, but I've already tracked in mud and cleaned them right off with no problem. I think I will probably have these going forward in any truck I own.