My 2WD '95 Powerstroke, Auto trans. , gets 11 - 11. 5 MPG pulling my 9,500 lb fiver, and about 18-19 commuting back and forth to work. It has 202,000 miles, and a 4. 10 rear axle. So, I am expecting (perhaps unrealistically??) the same or better out of a brand new Cummins with a manual transmission...