'06 F250 6.0 Powerstroke Crew Cab-120 HP street tune, 4" exhaust, stock size tires.
Empty- 12-13 around town, 16-17.5 Hwy
Pulling 4500lb rig on an18' car trailer- 10.5-11.5 around town, 12-14 Hwy.
Interesting thing though, last trip following a friend towing his rig we stayed mostly at 70 mph...