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post #16 of 22 Old 07-02-2012, 08:46 PM
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1999 XJ Cherokee 
Join Date: Jun 2012
Location: Pawcatuck
Posts: 46
I have a 99 Classic, 4 dr, auto. I was getting 15 MPG around town, jumped to 16 when I changed the transmission fluid. Make sure all the fluids in the car are good... I've heard of better mileage after changing diff fluid and transfer case fluid as well.

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post #17 of 22 Old 07-02-2012, 08:50 PM
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2001 TJ Wrangler 
Join Date: May 2012
Location: Indianapolis
Posts: 171
I drive city mostly and my average is 16.5...

I drive around 45mph everywhere with cruise control on almost all the time. Seem to be getting better MPG with cruise control.

When I first bought my jeep the average ECO was 14.2... after that i drove like a grandmother everywhere!
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post #18 of 22 Old 07-03-2012, 10:03 PM
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1999 XJ Cherokee 
Join Date: Jun 2012
Location: UpState
Posts: 154
I just bought a 99 XJ today and on the way home (248 miles) I got 24.3 mpg at posted speed limits (cruise control) and this things some serious work to get back to normal shape !!!
I checked MPG with the on board system and my scanguageII.
Rather happy with those numbers and once I get some new tires, fluids and tune up stuff I hope to gain some more.
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post #19 of 22 Old 07-03-2012, 10:41 PM
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1996 XJ Cherokee 
Join Date: Feb 2011
Location: Madison
Posts: 50
Originally Posted by Texsun View Post
I get 0 mpg

or 69 mpg...

I like your GRRR face @ 0mpg

and a normal face @ 69 mpg
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post #20 of 22 Old 07-05-2012, 07:53 AM
The clocks ticking, pops.
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1999 MJ Comanche 
Join Date: Feb 2009
Location: Cadillac, MI
Posts: 580
You can improve from 14. I average 16.5-17 mpg with mixed city/highway driving. I get 20-22 on the highway.

1999 Cherokee Sport 4.0/aw4, 5.5" lift, 33" STTs, 3.55 gears, 62mm throttle body, aFe intake, header into 2.5" exhaust with Magnaflow free flow cat and muffler.

Start simple with plugs, wires, cap, rotor. Check all your fluids, change your oil, run some Lucas fuel injectors cleaner through it. Change your upstream 02 sensor. Basically make sure everything is functioning as it should be. After that, intake and exhaust modifications can help a small amount. Doing all of this together will make a noticeable difference.


2005 WK Limited, 5.7 hemi, QDii, aFe intake, Magnaflow exhaust, Taylor shorties, Diablosport tuned

1999 XJ Sport, trail rig, lots of goodies
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post #21 of 22 Old 07-05-2012, 08:37 AM
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1999 XJ Cherokee 
Join Date: Sep 2004
Location: Salt Lake City
Posts: 9,491
I got 15.6mpg on my last tank running 31's 3:55 gears with some heavy armor

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post #22 of 22 Old 07-05-2012, 09:29 AM
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1998 XJ Cherokee 
Join Date: Aug 2011
Location: Green Bay
Posts: 250
Im the XJ I get 16.9 with a 4" lift with 32's and 3.55 gears and its a stick.

98 XJ
98 ZJ

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