I’m driving a 1998 FL70, 651,000 miles, dual 75 gallon tanks, 3126 CAT, Allision 6 speed automatic, 84†bentz sleeper, 22’ dry box, 2,500 lb liftgate, steer 10,500lbs, drive 13,100lbs.
55 mpg mostly non hilly highway miles I average 11.09 mpg to 10.298mpg
60 mpg mostly non hilly...