I have a 2002 f-250 7.3 liter and im getting ready to put a 6-1/2 inch pro comp lift with the 37x18 tires and wheels. Im also going to have it re-programmed with the super chip tuner. Can any of you guys out there that have yours chipped tell meif you are happy with the performance gains/losses or if it has improved or lowered your fuel economy im trying to get some input before i actually have this done.Thanks.