I just put a 4inch lift and 31's on the xj. truck is bone stock otherwise, I was getting 17.5 mpg now im getting 14. can I get any mileage back at all by adding a good intake and exhaust? Or will anything else help? And what are you guys doing to re clac your speedo for the 31's?

 

Sure the difference in calculated mileage isn't due to the 31s versus the stock tires? Ever recalibrated your speedo?

 

No, thats why I was asking what you guys are doing to recal the speedo after bigger tires.

 

Recalibrate your speedo youll need a new speedometer gear in the tcase

 

do you have a manual or auto trans? cause you might be able to use a stock one from a junk yard and getting it close

 

Bought a GPS unit. That's my speedo now