Gas Milage low? - JeepForum.com

 
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post #1 of 8 Old 11-24-2003, 06:15 PM Thread Starter
jastern05
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Gas Milage low?

For some reason unknown to me (that is why I am posting) my gas milage is horrible. On the tank I am on now I have gone 123 miles and there is only 1/4 of a tank left. These tanks hold 23 gallons. You can do the math, but that puts me at about 7 mi/gal which is god awful. Granted all I drive is on local roads, no freeways really, but it is only a I6 and I figure I should get at least 10 or 12. What could be the problem? Anyone have any ideas.


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post #2 of 8 Old 11-24-2003, 07:07 PM
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I get 10 mpg city driving with my 5.2 V8 in 2wd.
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post #3 of 8 Old 11-25-2003, 07:00 AM
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Sounds bad, but need more info - what's your driving style? If you have a lead foot and tend to accelerate hard, or if you let it idle for long periods, that will affect mileage a lot. Also if you do a lot of towing - if you live in mountains - well, you get the idea.

Also, the gauge may not be terribly accurate. Keep track at each fill-up and see what your calculated mileage is. And since the tank may not be getting filled to the exact level each time, your most accurate numbers will be attained by calculating any three consecutive fill-ups.

Having said all that, you may have an exhaust restriction, maybe from a cat or muffler collapsing internally. Or simply a dirty air filter. How long since the last tune-up? Might be time for cap & rotor, plugs & wires.

Edit - What gears are you running? Also, larger tires & lower air pressures will have an adverse effect on fuel mileage - as will lift kits -

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Last edited by Stocker; 11-25-2003 at 08:33 AM.
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post #4 of 8 Old 11-25-2003, 08:15 AM
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yeah that gauge isnt the best measurement, even when mine says i am bone dry, i will usually still have 3 gallons in there.

i get 15 in city and 20 on highway on my 95 I6, give or take....


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post #5 of 8 Old 11-25-2003, 09:25 PM Thread Starter
jastern05
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Quote:
Originally Posted by Stocker
Sounds bad, but need more info - what's your driving style? If you have a lead foot and tend to accelerate hard, or if you let it idle for long periods, that will affect mileage a lot. Also if you do a lot of towing - if you live in mountains - well, you get the idea.

Also, the gauge may not be terribly accurate. Keep track at each fill-up and see what your calculated mileage is. And since the tank may not be getting filled to the exact level each time, your most accurate numbers will be attained by calculating any three consecutive fill-ups.

Having said all that, you may have an exhaust restriction, maybe from a cat or muffler collapsing internally. Or simply a dirty air filter. How long since the last tune-up? Might be time for cap & rotor, plugs & wires.

Edit - What gears are you running? Also, larger tires & lower air pressures will have an adverse effect on fuel mileage - as will lift kits -
Yea, I drive in a town to get to school and then home. Then on the weekends around town too. I do tend to accelarate fast, but that would make me get 7 miles to the gallon. Normal tires, no lift, i have 30psi air tire pressure. Is that too low? What do u mean what gears? My mechanic said the engine was running rich. Meaning too much gas was being used. He cleaned something on the engine that might be causing it, i don't know the name though. The exhaust tip had black sud on it from running rich and there was always the smell of excess gas. That seems to have gone away, i guess ill check out the gas milage on the next tank.

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post #6 of 8 Old 11-25-2003, 09:45 PM
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Hopefully the mechanic fixed whatever was causing it to run rich - if you smelled gas and the tailpipe was sooty, that's probably the culprit. You should get better than 7 out of an I6 no matter what. By gears I'm referring to the axle ratio, but it would make more difference out on the highway than around town. 30 psi may be a few pounds low, although I doubt that would noticably affect your mileage.

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post #7 of 8 Old 11-26-2003, 06:50 AM
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Running rich will kill your cat. converter. I second the exhaust restriction. My cat had to be replaced at just over 110k. Our jeep was not able to get to 70 mph before the end of an on ramp near our house and I knew the I6 was capable of doing it. replace the stock Cat if you still have it.
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post #8 of 8 Old 11-26-2003, 08:49 AM
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I agree with Stocker - maybe a tune up - plugs, wires, cap and rotor are in order. However, If it's running rich, the O2 sensors may also be the culprit, moreso than the cat. When the ZJ is cold, bang on the cat with the palm of your hand. If your hear alot of rattling from inside, like a can full of pocket change, then your cat is toast. Your O2's should be changes every 60k miles as regular maintenance.

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Last edited by 97grand; 11-26-2003 at 08:52 AM.
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