O/O of a 1998 FL70 with CAT 3126, 6 speed automatic, 22' dry box, 84" sleeper and liftgate scaling out with full dual 75 gallon tanks plus personal gear at 23,000 pounds.
Last 2 loads I got 11.3 mpg driving 55 mph and 10.5 mpg driving 60 mph right after these loads I had oil changed along with...