Most chips will give you 2 mpg if you keep your foot out of it. We sell alot of the TS 6 position chips for the 7.3L and most people report 2 mpg some even 3 mpg. Keep your tire pressures up to spec also, this will help alot. Oh ya, the 7.3L benefits alot from an intake, even a K&N drop in replacement will help.