I have a 2013 with the 6.2. I love it. I bought it used a year ago with a 3 or 4 inch lift kit and 18 inch wheels. I only get about 11 mpg. Anything I can do to get a little better? I know the mods are a big part of it. Also, as far as I can tell it is stock as far as motor goes. I do love the power!