I just saw this thread and read through it. I like your air dam. I think it would make a great attachement point for a smooth under panel
Also what is your typical driving route and style. I would love to have your truck. I would have guessed the mpg's would make it into the 30's on occasion, but looking at your fuel log it seems to have capped around 29. I'm guessing you have things in store to break the 30 plateau this summer