Well as of today, I've had my 2011 Laramie LongHorn for 9 months and my average MPG is 15.3. That is a combination of higway and city. I'm guessing this about average for a HEMI. I'm running AMSOIL 0W-20 full synthetic, the AMSOIL Ea Air Filter and AMSOIL rear diff fluid. Was actually hoping to see between 16 and 17 for an average, but as I've heard so many times, we didn't buy these trucks for gas mileage.
This ethanol mixture at the pumps is killing the MPG, bottom line.