6.5 out west and 7.5 in the east at 65+ and 44K lbs. My combined car/MH is 13 as we usually put as many miles on the car. I just bought a Prius so my combined may go to 28 MPG.
*I did a 100 mile test at 45 MPH on a rural WY road and got 10 MPG but I did not want to take another day to get home or be a slow poke holding up traffic. Actually at 90 miles into the test I put the pedal to the metal.:B
Without posting the speed you run at and how much you weigh a MPG does not mean much. OP, by pulling a car your combined MPG can be much better than your diesel PU and 5er.