I average 15-16.5 city/highway mix; 18-21mpg all highway at 70mph. I have the 4x4 Crew with the 3.55LSD and when towing my 3000lb bass boat I average 13-14mpg. I also didn't buy my Ram Hemi for the economy BUT! It is nice to see the fuel needle move to the left so much slower than my old 99 Magnum 5.9! I switch between mid grade and supreme on a normal basis depending on the depth of my wallet.