With such small displacement, it's going to get pitiful mileage since it'll be running at such high rpm's to stay in the power band. If it is new (5.4 has always been offered although this may be a redesign) maybe they are pushing it to phase out the problematic V-10. I'm sure it will tow your rig home without blowing something up but I doubt you'd want to go much more than 60mph after you figure out the fuel consumption numbers.
BTW--a buddy has a 250 with the 5.4 and all the mods(intake, exhaust, chip, what not..) and it can't hardly get out of it's own way and sounds like a lawnmower on top of everything else :squiggle:
maybe check out 04---or LATE 03 Ford diesels if you can't jutify the extra expense on a new one...let someone else take the depreciation hit :mix: