I estimate its around 28 miles more, so you may be closer to 200 miles for that tank. The problem isn't just the difference in the odometer, it also has to do with the extra gas pedal you're pressing to make the vehicle go down the road.
Are you driving in 3 all the time yet? If not, this discussion is pointless. Re-gear if you're not going to at least try it.

 

I have been driving in 3 most of the time...also when I fueled up it took 17.5 gallons and when I refuled it took 17.2 so its pretty accurate.

I'm planning on re-gearing but what kind of MPG's would I see? As of now I'm getting around 10.5 mpg would it be a significant jump?

 

Yes it will be significant. It's different for every rig. I've heard of people jumping 6 mpgs when regearing and I've heard of people jumping 3. Either way, I see that as a huge improvement

 

Sounds great!!!!

Stay tuned boys and girls here in a couple of weeks ill be re-gearing log into my build to check! I orrder the gears this Friday hopefully by then I decide between 4.10's or 4.56's!!!

 

And if I'm correct, and you're traveling 28 more mile per tank than what the odometer reads, then filling to 17.2 gallons would be just over 12mpg- which isn't too far off the mark for a lifted XJ on 33" tires.

 

Well my goal is to get 15mpg

 

That is definitely attainable with the proper gears, a header that isn't cracked, a fresh upstream o2 sensor, a cat that isn't clogged, etc etc

 

According to the PO he gutted the cat...im thinking of just not running one when I redo the exhaust

 

Bite that tongue of yours, sir. Best bet is to not say those words or the thread is gunna get shut down

 

Omg what im from Tx!!!

 

Last time I checked that was still a part of the US: https://www.cherokeeforum.com/f2/cat...er-laws-24337/

 

 

Ok so this time I managed to get 195 i think all the old man driving helped




Quick question Im limited on funds so Im thinking of regearing my rear end for now and doing the front in a few weeks. Would it screw up the drivetrain I heard some of the jeeps had full time AWD?

 

Nah if you stay in 2H you'll be fine. Different gears in an NP231 will definitely cause serious problems if you put it in 4WD. For an NP242, which has the full-time 4WD, I don't imagine it would be good but I don't think you'd face a failure as drastic or fast as with a 231

 

My experience was gearing, replacing o2 sensor, and exhaust (including cat) made the biggest difference in mpg.

I thought my exhaust wasn't too bad until I replaced it with 2.5" pipe. I found the packing in the cat had collapsed, the stock muffler had also collapsed internally.
With the replacement, my highway mileage jumped from 13 to 16.5!

I have a 6.5" lift, roof rack, and 32" tires.....