I get an average of 9 Towing, best of 11.2, worst 6.9 @ 60-65 MPH. I tow in central Texas (slightly hilly), and down to the coast (flat but occasional headwinds).
Around town driving with no trailer averages 12.8.
TV is a 2015 F250, 4x4, Crew cab, Long Bed, 6.2 gasser with 3.73 rear.
The 28RBDS as we load it is probably 8K lbs. Need to get it weighed.
I'm very happy with the setup.
2016 Jay Flight 28 RBDS
2015 F250, 6.2L