I thought it would be good to have a thread with observed Gas Mileage, along with your observed RPM's at different speeds, as well as tire size, gear ratio, performance mods, etc, for other's to compare to.
I drove the runner to work the last two days.
At an indicated 55MPH, my actual was calculated to be approx 60MPH, and my indicated RPM's were 1700. At an indicated 68 MPH, my actual speed was calculated at 75 MPH, and my RPM's were 2200.
I had approx 160 miles of interstate driving with some hills at a steady indicated 68 MPH (no cruise set), and then another 78 miles of back-roads and city streets, some very hilly and curvy, causing lots of acceleration, braking, etc. I got ~16.7 MPG on this last tank! That's with 315/75-16 tires as well.
Tires: 315/75-16
Gears: 4.56
Performance Mods: None
RPM's at 60: 1700
RPM's at 75: 2200
MPG: 16.7 (2/3 highway mix, with hills)