I have a 2007 Pathfinder Aventura auto. The economy is horrendous - 24mpg combined. I have recently had a performance chip added by Paramount Performace and the economy is now below 20mpg. PP have toild me that I need to run the car for 500 oddd iles before I see any improvement. Does anyone else have any experience of this as I was lead to believe the improvement would be immediate. Is this common to all Pathfinders or do I have one which is particularly bad. I would like to get 30 mpg and that is what the list mpg should be.
Any help / advice would be much appreciated.