Personally I use my NAV system for my calculations. Any the 80 gets 12.5 - 14 MPG depending on conditions sitting on 35's at 6800lbs unloaded. Kind of surprising you 100 guys don't so a little better.
Speski OffRoad LTD, Cargo Solutions for Toyota 4x4's http://www.SpeskiOffRoad.com
"80 series, with a fridge"
1976 FJ40, Project with little progress.
2004 Starcraft 10RT