I am the one that can tell you. I have a 6sp. 4dr Quad 350. It is a 04. I also have a 14000 lb trailer. I hope it will do as good, compaired to running empty. O well I Will get to thefuel mileage. Running around town 18to19. On the road at 60mph, 23mpg. I know. Iwouldn"t have believe it either if I han't done it with a pencil.