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Unread 06-11-2013, 04:23 AM   #1
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98 Cherokee sport gas milage

Good morning all, My 98 Cherokee is only getting around 180 miles to a tank of gas. Does anyone know of a computer chip that would shut down a couple fuel injectors, so that it would be a four cylinder when needed and I can turn a knob or push a button to switch it back to 6 cylinder as I need more power?
Thanks. Mattsy

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Unread 06-11-2013, 03:05 PM   #2
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1998 TJ Wrangler 
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Moved to Cherokee Forum.
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Unread 06-11-2013, 03:28 PM   #3
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1997 XJ Cherokee 
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Even if you could do that, which you can't as far as I know, you wouldn't really save much if any gas because the other four cylinders would have to work that much harder to move the dead weight cylinders. Heck even the REAL 4-cyl engines that literally are the same as the 4.0 minus two cylinders don't get much better mileage than the 4.0. There are a million threads on XJ and/or 4.0 mileage. There's no magic bullet, but look those threads up to learn what you CAN do.
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Unread 06-11-2013, 04:03 PM   #4
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my 01 only gets 210 miles per tank on a good day 180 on a normal day what are your modifications everything you do will cut into your mileage.
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Unread 06-11-2013, 04:17 PM   #5
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2000 XJ Cherokee 
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Location: out in the garage - Minneapolis, Minnesota
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Miles per tank has no meaning at all, sort of like ants per picnic. The gas gauge is not calibrated, and the readout is not linear, it is just a more or less indicator.

Calculate your actual Miles Per Gallon, and then use the Google to compare your results to other XJ owners with similar modifications. If necessary, adjust your MPG figures for non-stock size tires and/or gears.

To increase your MPG's, do all the normal stuff, tune-up, make sure your tires are properly inflated, and perform any necessary maintenance/replacement required to the catalytic converter, O2 sensors, and other engine sensors.

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Unread 06-11-2013, 08:55 PM   #6
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1998 XJ Cherokee 
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Tank size is about 18 gallons if i recall correctly. Getting 180 miles on about 18 gallons is only about 10 mpg. Something sounds out of whack. Time to think about a tune up, O2 sensor, etc or take it easier on the gas pedal.
For reference, my 98 4.0 w/ 5 spd gets high teens routinely back and forth to work. I'Ve gotten low 20's on the highway. My daughter got 25 coming home from college once on some good southern summer blend gas (I'm convinced regional and seasonal differences in gas blends can have a big effect on mileage).
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Unread 06-11-2013, 10:37 PM   #7
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I get about 240 ants per picnic...
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