i pull mine a 21 foot stratos with a f-150 with the 4.6. it pulls ok but the gas milage is terrible. mine has 3.55 gears that may be better for you with the 3.73, but my experience with fords is all of their gas milages stink, and is compounded when towing. i would also consider that the expidition is probably heavier than your pick-up, i would think that would hinder your mpg also.