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Unread 01-22-2011, 07:32 PM   #1
wallick912
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1999 XJ Cherokee 
 
Join Date: Oct 2010
Location: Lancaster
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Cherokee MPG

Ok i know jeeps will never get good gas mileage but mine seems to be running abnormally low. Im averaging around 14 and its not lifted and it doesnt have big tires. It is a 1999 classic. I didnt know if there was a part that could be replaced like the o2 sensor that could bring the mpg back up. And also, does anyone know if jeeps have to go through a cycling or re-calibration process when the battery is disconnected like some cars do. Thanks for the any help.

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Unread 01-22-2011, 07:38 PM   #2
imthehink
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Thats normal lol. If I remember correctly, my window sticker said 15 city 20 hwy. And thats a negative on the battery question. There are products to claim better mpg but come up short. Throttle body spacer, k&n, "cold air intake" are useless imo and a waste of money. Ive had them all.
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Unread 01-22-2011, 08:06 PM   #3
misscla
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2001 XJ Cherokee 
 
Join Date: Apr 2010
Location: Newton MA
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I get 14 to 15 right now on my '01 too and mine is stock also.... my grand was getting 9 so I feel like im driving an econo car compared to it.
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Unread 01-22-2011, 08:19 PM   #4
Holder350
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To remove adaptive memory from the PCM,

Remove the positive cable from the battery and touch it to a metal surface to ground it.

Replace it and turn the key ON but do not start

Turn on headlights, turn off headlights, and turn key off.

Adaptive memory has been reset.


As for the MPG, the story goes.....Buy Jeep, Get horrid mileage, complain about it, love the jeep to much to get a gas sipper.
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Unread 01-22-2011, 11:16 PM   #5
NJXJ91
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Your lucky to get 14.
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Unread 01-22-2011, 11:20 PM   #6
2doorxj
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I have a 98 5 speed geared 3.73s, with 33x10.5. i average anywhere from 16-18 mpgs per tank. I also drive like there is an egg under the skinny pedal. When i drive more agressivly, i get 12-14.

Im telling you, its all about your driving technique.
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Unread 01-23-2011, 09:33 AM   #7
wallick912
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Yeah thats what i figured. Thanks for the help anyways. Its just that some people say they get 18-22 mpg but I guess they just drive highway more. But i don't really mind putting the money into gas because i like my jeep so much
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Unread 06-30-2012, 02:22 PM   #8
USCGTheHoff
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Im driving a 96 zj and Im getting on average 15-22 with an engines that has only had a few repairs here and there. But has 227xxx miles on it. Compared with most its pretty damn good. Still running stock.
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Unread 06-30-2012, 02:31 PM   #9
Texsun
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I get 0 mpg




or 69 mpg...


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Unread 07-01-2012, 12:38 AM   #10
Muddy97Cherokee
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Quote:
Originally Posted by Texsun
or 69 mpg...
I've never heard of a jeep with a prius engine before! Please lead me to that thread, I want to save money!!! Lol
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Unread 07-01-2012, 07:42 AM   #11
JGriff99xj
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I can do that in mine too. Coming off an off ramp on the highway, drop it in neutral and see how high the numbers will go.
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Unread 07-01-2012, 10:48 AM   #12
DerMeister
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14mpg is not normal IMO. Maybe in the winter with cold temps, city driving and 4wd. Start with the basics, and move to the not so basics.

Tune up,
Plugs, Rotor, Wires, ect.
Air filter
Check your engine grounds(the one from the back of the block to the firewall) and replace. Check your battery and alternator cables too.
Run some fuel injector cleaner through a few tanks.
Use proper air pressure for your tires, get an alignment, make sure your brakes aren't dragging and everything spings as it should.

Then move on to things like fuel pressure, upstream 02 sensor, exhaust leaks, vacuum leaks.

I was getting around 14.8 mpg no matter what I did with 50% City and 50% Highway driving. My driving style was average. I even got 13.8mpg one time when I was running the AC all the time.

I replaced the plus, and the firewall ground to start off my "get better MPGs" mission and I got 17mpg this fill up. 50/50 city/highway with AC.

Lifted 2" with 235's.

I'm sure I missed a few things, but you get the point. Start with the easy routine stuff, then go from there.
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Unread 07-02-2012, 08:31 PM   #13
SuperSam
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stock i was getting a8 with a mix of freeway and city. I have noticed that short trips really kill the MPG. I just replaced the O2 sensor and it went up about 1mpg. You can find them for ~$30 on amazon, just look up the part # elsewhere.
x2 on the tune-up.
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Unread 07-02-2012, 08:34 PM   #14
SuperSam
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****18, not a8,
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Unread 07-02-2012, 08:37 PM   #15
michaelleegarre
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i have a 98 sport with a 2'' budget and 31's i get around 13-14 city i got lucky one time and got 18 idk how
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