My boss has a 02 one ton 4x4 auto with 65000 miles on it and we drive 600+ miles for work one way. And we are lookin for something to help out on milage. Is bone stock as of right now we will be gettin a cold air intake and a 5 inch exhaust here in two weeks when we get back in. Any info will be helpful thanks

 

honestly save the money and go 4" you gain no power from 5" and it's louder to me spending 600+ miles in the truck with loud exhaust sucks. you need a fuel system upgrade like a fass then get a edge juice cts so you have all the gauges needed so you can monitor fuel pressure egt's etc. I found I get better mileage on the higher settings, but you gotta keep your foot out of it. also a good mileage gain is to swap gear oil and motor oil for synthetics.