I've gotten 15.9-20.9 and everything in between.Overall it averages out to 18.1 for the year I've had Da Heap

All stock except 235/75/15 tires,3.07 gears,5 speed,4.0

My driving's usually stop-n-go country roads about 9 miles at a time.Mostly having just enough time to get up to 55-60 and then the second I do it's time to stop or turn off,so basically always either accelerating or coasting.Just one spot where I can cruise for about 3 minutes,another for about 2 minutes

Been doing a lot more idling than I'd like since it's been cold.I sometimes start her up about 5 minutes before time to leave home,and again about 5 minutes before time to leave work.Problem is,I often end up not actually leaving work till anywhere from 20 minutes to an hour after my shift's over,so I have a 12 minute drive,but the car's often running for well over an hour

I've always had the habit of keeping the rpm's low,but after reading lots of comments here about folks not using OD and getting better mileage,I decided to try that.Yesterday's the first day I've tried it,and I just filled up yesterday too,so next fillup Ill start seeing if it works for me

 

Update;
I have a decent exhaust leak at the manifold (I assume it's cracked), my O2 sensors are several years old now, I've not changed plugs, wires, cap rotor or coil in many years and all of my driving is on surface streets...
I'm getting around 16mpg.

 

I'm sure all XJ's with the stock exhaust header has a crack. Mine does, couldn't care less lol.

 

I do a mix of around 50/50 highway and city driving. I average around 22mpg with mine. Couldnt be happier, pretty good mileage for a 97 cherokee 4.0 with almost 220,000 miles.

 

2001 Sport all stock. AW4.

6 mos. old Champion Copper core and plain Jane Purolator air filter.

15-17 city

18-19 hwy

 

Forgot to mention my O2 and exhaust leak situation.Exhaust leak broke loose recently,dunno if it's the gasket or header.O2 is probly original for all I know,it's rusted pretty bad,and apparently I'm missing an O2...and the cat

Only O2 I can find is up on the header,but I think there should also be 1 after the cat (?) and there's no sign of a cat either I occasionally have a dog IN the car,but it'd still be nice to have a cat ON the exhaust pipe I'm guessing that may very well be making her run rich

Got about 300,000 mi too,but no idea how many on the engine.PO claims it has a Jasper engine,and there's an official Jasper sticker on the firewall,but no date or mileage on it,or receipt for it,despite the huge pile of receipts dating back to when she was brand new,so who knows

Oh yeah,also has a K&N,WITH STICKER on the back window,so 50 more HP right there

 

15-17 hwy

10-13 city

1995 XJ Country, 3.5" lift, 31x10.5 BF MUD T/A, Airaid cold intake, Poweraid throttle body spacer, flowmaster muffler.

4.0 HO
8.25 rearend - 3:55 gears.

 

1995 sport 195K, stock with 235/75R15's, fresh tune up, recent fluids

15-16 city
16-17 hwy

 

2001 sport 113,000 miles, 4.0 AW4, C8.25 out back. Had it about 5 months, slowly replacing/upgrading all the parts PO had neglected. Steering, hubs, general maintainance, etc... Stock for now until spring when I can afford a lift kit. Average about 19 overall, depending on how much mud I can find to wheel around in of course!

 

2001 Sport AW4 D35 stock was getting 15-16 in town....now down to 10-11mpg....just ordered an upstream O2 sensor, hopefully gets me back up to where I was!

 

@ Zombie - SWEET sig!

 

92 xj 4.0L mild cam, auto, 35s

i normally get about 15-18 highway but recently got 9-11
for city driving i get around 10

 

99 XJ 4.0 5-speed, overhead console puts me at 19.4mpg. I average 24 on the highway but driving around Boston puts a big dent in the average.

I do love the big slope on I-95N going into the tunnel when the realtime mpg readout on the console shoots up to 99mpg

 

00 Xj 3 inch lift 32s and I get 18 around town

 

97 XJ Country, mostly stock: 3.55 gears, 4sp AT, 141k.
Relevant mods: 703 injectors, Stage 1chip & 235/75/15 tires.
I get 14 in the city, 20 highway.