Worst milage on my 150 was 14 pulling a enclosed trailer. I average about16 to17 pulling my 22 foot center console boat. I had a 74 Bronco 302 with a three speed auto. It got 10 MPG in 2 wheel drive, 10 MPG in 4 wheel drive, I think it would have gotten 10 MPG if I drove it off a cliff.