What year are you looking at? 2005 and up f250 and f350 have the 3v 5.4, a 5 speed automatic, and a coil over up front. I had a 2 valve 5.4 and a 3 valve 5.4 , both f150's, and found the 3v was slightly better on gas. I don't have experience with the 5 speed auto, but I think it would be a...