I can get up to 22 highway solo if 60 or under, 20 to 21 if running 70 to 75 and 18 to 19 running 80.

Pulling a 30' award travel trailer from 11 to 14 depending on speed and wind.

Utility trailer empty about 17 to 18

with a 123 mb on back about 16 to 17

with a 39 studebaker on back about 13

flat towing a 123 mb about 18 to 19 running 80.

03 dodge 3/4 ton quad cab 2 wd cummins with six manual and 373 gears.

__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.