Edge chip help!?!?!?!?
 

I have a 2004 F-250 6.0L with a K&N air intake and a Edge Evolution chip. Is there anything I can change on the settings of my chip to improve gas mileage?? Or even change something not related to the chip to get better gas mileage?? I'm currently getting b/n 12 and 13.5 mpg around town. Any help is appreciated.