Last trip I took I was getting 17-20 mpg in my 01 xj 4x4. Drove about 1200 miles that trip. That was when I had a blown fuse and didn't know it so my trans liked to drop out of od for must of the trip. Kinda funny cuz my 84 suburban with a 350 got the same mileage.

 

mpg, my last worry! it runs good...

 

I havent owned my current Jeep long enough to be positive about the gas mileage but its way better then what I see on this thread. What I can use for comparison is my last XJ. I owned it for 4 years and it was my DD. On many many many 400 mile river trips I took in it, I typically averaged 22-23 mpg doing 70-75 mph. Combined city/hwy driving, I averaged 16-18 mpg. I put about 50,000 miles on it and that was the average the entire time. I used the ODO miles + bigger tire % to get miles divided by gallons at fill up. The built in average mpg display was always about 2-3 mpg off. It was a 98, 5 speed, 31s and 3.07s with new engine and small Comp cam. But with my current Jeep, I really dont care what it gets. I dont drive it enough.

 

I put 60k/yr spread across 3 GCs. The 2000 gets 17-19 hwy in the summer cross country (my vacation buggy). The 98 & 95 do 15-17mpg most of the year, mixed local & highway. The 95 gets the brunt of really cold snowy winter with lots of idling, and long bouts of 4wd (100 miles at a time) in snow. It gets 10-12 under those conditions. The 91 XJ I used to have was my main dd for 100k. 15 on hwy, 10 while 4wd snow eating in winter. I don't really care as long as they stay working. In the last ten years they only stranded me a couple of times - starter x1, fuel pump x1, and a couple of flats. I wish everything I had worked that good. The gas mileage is the least of my worries. If I wanted good gas mileage I'd drive my daughter's honda.