so i just moved from battle ground WA which was at 500 ft to Butte MT which is a mile high! is there anything you need to change out when going to a new elevation??

 

if you have a newer XJ with the throttle body instead of carb, it'll take a bit for the ECU to relearn the fuel mixture, that's about it. If you have a carb you may need to adjust the mixture. You'll eventually get a little bit better MPG but it'll be barely noticeable. I moved from VT at about 2400ele to CO at about 8900ele and have been here 3 years. I barely noticed anything other than the first time I drove over the continental divide, the day I got here, it seemed a touch sluggish. Since then it's back to normal A-OK!