2003 Dodge 3/4 ton. 5.7 L Hemi. Just checked this afternoon, did a 30 mile run, 15 down, 15 back. Set the cruise at 55 going down (1500 RPM's), showed 15.6 on the computer when I turned around. Set the cruise at 65 on the way back (more uphill, but only slightly), computer registered at 15.7 (1800 RPM's). I just recently changed spark plugs, and just today, O2 sensors. I was getting 14 on a good day on the highway, so we will see what the average is now.
Marcial