[popeye]

i would say anywhere between 13 to 19 imp mpg's on the hiway depending on how heavy your right foot is. my sister inlaws 07 roush supercharged f150 4x4 ext cab with 425 hp gets 15 to 16 on the hiway. my wifes super crew 02 f150 4x4 got as good as 21mpg's with the stock tires on it.