I understand the smarty is a device that may improve mileage.What exactly does the smarty do? Or how does it work? Does it negate parts of the warranty? I appreciate your patience. It seems like everyone understands this but me.

 

its a programer that tunes the computer differently and when returned to stock the dealer will never know

The smarty jr is a much more conservative verson of the smart sr

 

http://www.madselectronics.com/SmartyJR.html

 

Thanks very much. That site was just what I needed.