Join Date: Aug 2011
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I had a very similar problem with my 02 7.3 while towing my Jeep on trialer. Only about 6000 lbs.
I have Ford AIS (I changed it to AirRaid after the trip), I have TW chip, BB Garrett Turbo and 4" exhaust. I felt the truck could not breath properly with Ford AIS. My mileage went down after I installed Ford AIS. I use to get better mileage with AirRaid.
Last edited by dieseldesi; 08-11-2011 at 12:36 PM.