This is my second RAM, never get nothing better than 19.7 hwy or 16.0 city. I have a New Lone Star 4x4 3.92 after the 2nd gas tank I am getting around 14.0 to 15.1 city. and 17.6 hwy. To be honest I try not to pay a lot attention on MPG, I have own trucks for the most of my life and I enjoy drive them, and sometimes our pocket pays the price for it.
Just took this pic 01/2/2012. 3.92's LSD 4x4. 15.1 is not too bad IMO.