The other day I was traveling along I64 in West Virginia. I was loaded with 12 pax plus luggage. The cruise control was set at 73 in a 70 MPH zone. Without touching the accelerator, I started the climb on a 7% grade.
At the top of the 5 mile run (distance not change in elevation) the engine had smoothly downshifted twice and was still running at 63 MPH all without touching the accelerator & cruise control still engaged. I was still passing cars. I am impressed with the overall power of Ford's 'little' I5 diesel with 6 speed transmission, 3.73 limited slip rear end. Remember, this is their biggest model with the high roof, extended length, & dual real wheels. For those interested in the fuel economy for this trip:
1,413 miles from Southern Maryland (Waldorf, MD) to South Central Kentucky (Campbellsville, KY) via I-64.
78.1 gallons of diesel
18.09 MPG overall
341 miles, 20.6 gals, 16.55 MPG, Westbound
401 miles, 20.2 gals, 19.85 MPG, WB
246 miles, 16.7 gals, 14.73 MPG, EB
425 miles, 20.6 gals, 20.63 MPG, EB