It would be magic Bill.. considering the 5.0 Coyote engine in my F150 is averaging 12.8 l / 100km. I haven't hit reset since I bought it with 1.8km on it and that includes all the trips up and down college street, to Mount Sinai, since I got the truck in January. Currently has 5000k on it... (and has already shed the first layer of rust off the exhaust manifolds! ) 5 lt / 100km would be a 40% gain in economy !