So I plan on using my 98 zj as a DD. So what kind of mileage are you guys getting from your Daily drivers? And any tips or mods to make it better.

 

I promise you friend, the search button and Google do wonders. There are countless threads about the 4.0 mileage and ways to improve it.

I used to DD mine, and I get about 12 city and 18-20 highway. Don't stomp the skinny pedal, coast when you can, swap injectors, full tune-up, don't run mud tires on the street and if you do make sure they're aired up, buy a small car for DD'ing.