I don't think too many guys run a milage max. They are a pressure box. They add very little power and 7% better milage. My suggestion would be a smarty JR for more power and milage. It can read and clear codes which is great. The milage max is a "chip" that will not last forever. I have seen problems with harnesses or the chip just quitting. Smarty Jr is a programmer so no worries about that.