As long as your not towing the 5.4 is a pretty good motor! I keep thinking I would like to try a supercharged 5.4 in a SD as I think that would be a great combo for the "unloved" 5.4's out there! But I think the mileage may just be a little better than the V-10 so it could make a winning combo. If I could only find a reasonable priced s/c system?
Jim...& fat Monty