How can I improve the gas milage on my 97 ZJ?? - JeepForum.com
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post #1 of 25 Old 03-04-2010, 07:55 PM Thread Starter
ufc925
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How can I improve the gas milage on my 97 ZJ??

So I know that I may sound like a noob asking this question, but I just don't know who else to ask. What can I do to my 97 ZJ to improve gas milage? I heard a cold air intake would improve but its like $500+, and im not sure it would make a huge difference. I'm getting like 230 miles on a full tank, or almost 13MPG.. My wallet is starting to feel the pain.


Anyways, I'm open to all suggestions. Thanks!

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post #2 of 25 Old 03-04-2010, 08:20 PM
Az-Green
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Get literally any other vehicle on the planet. Jeep's have the aerodynamics of a brick and the 5.2L doesn't help you any.
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post #3 of 25 Old 03-04-2010, 08:58 PM
lateralus3
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give it a good tune up. plugs, rotor, wires, oil, oil filter, fuel filter, air filter. when i first bought my zj i was wondering why it wasnt getting very good gas milage, well i poped open the intake box and i had a squirrels nest in my intake. cleaned it out and put a new filter in and was much better lol

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post #4 of 25 Old 03-04-2010, 09:13 PM
rm2001wj
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A cold air intake might give a little more power at higher rpms when at wide open throttle, but it can't improve mpgs. Do the tune up and consider replacing the upstream O2 sensor.
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post #5 of 25 Old 03-04-2010, 09:22 PM
jeremy8302
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The simple answer is to drive slower. I stick to 65 mph on the freeway and try to keep it under 2000 rpm as much as possible. I get 18.5-19 mpg and I catch up with the people that race past me in most cases.

1998 ZJ Laredo SE 2WD, 4.0L I6, 142,000 miles, 42re (re-built), clear headlight housings, 9007 conversion, clear corners, K&N drop-in filter, 70 series flowmaster

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post #6 of 25 Old 03-04-2010, 09:50 PM
4Slow9erHybrid
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What's the ethanol content of the gas you are using? I saw a consistent 20% drop in mpg when Shell introduced the 10% ethanol in their regular gas. So now I bought Costco gas (no ethanol is indicated at the pump), and it seems my mpg is back to normal. Need to drive a bit longer to be sure. In city traffic you won't get more than 15mpg, except if your "city" has only one intersection. You'll see sometimes people on here claiming 18mpg "city".

On the highway keep your speed below 65mph, makes a huge difference.

1997 JGC Laredo 4.0 4x4 99900mi * 0W30 German Castrol since 75k * 225/75/R15 Firestone Destination AT on Ravine rims * winter 235/75/R15 Bridgestone Blizzak DM-V1 * UC suspension * Monroe Reflex Monotube shocks * factory skids * KOR steering brace * rear Addco SB * Magnaflow cat and cat back system * complete 5.9 interior
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post #7 of 25 Old 03-05-2010, 04:30 AM
Technohead
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Aside from a basic tune-up there is nothing you can do that will recoup your investment. If gas mileage is an issue then you are driving the wrong kind of vehicle.
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post #8 of 25 Old 03-05-2010, 09:18 AM Thread Starter
ufc925
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Its been tuned up and i just recently took care of all that stuff. Is it true that switching to a premium synthetic oil will help MPGs?
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post #9 of 25 Old 03-05-2010, 01:44 PM
4Slow9erHybrid
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Quote:
Originally Posted by ufc925 View Post
Its been tuned up and i just recently took care of all that stuff. Is it true that switching to a premium synthetic oil will help MPGs?
NO! Don't switch to synthetic in hope of getting better mpg. I have synthetic fluids all around, except the power steering. But it's to reduce wear and to be able to change the fluids less frequently. You might gain a bit of mpg if you live in extremely cold climate and do lots of short trips.

1997 JGC Laredo 4.0 4x4 99900mi * 0W30 German Castrol since 75k * 225/75/R15 Firestone Destination AT on Ravine rims * winter 235/75/R15 Bridgestone Blizzak DM-V1 * UC suspension * Monroe Reflex Monotube shocks * factory skids * KOR steering brace * rear Addco SB * Magnaflow cat and cat back system * complete 5.9 interior
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post #10 of 25 Old 03-05-2010, 02:09 PM
melk
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New plugs and air filter are your easiest and cheapest options.

Next up, as someone else mentioned, replace your O2 sensors.
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post #11 of 25 Old 03-05-2010, 03:21 PM
Dukota
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Quote:
Originally Posted by rm2001wj View Post
A cold air intake might give a little more power at higher rpms when at wide open throttle, but it can't improve mpgs. Do the tune up and consider replacing the upstream O2 sensor.
Not true. I bought a $49 cold air intake off of ebay and picked up a couple miles per gallon. I made no other changes.

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post #12 of 25 Old 03-05-2010, 03:39 PM
subliminal
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Quote:
Originally Posted by rm2001wj View Post
A cold air intake might give a little more power at higher rpms when at wide open throttle, but it can't improve mpgs. Do the tune up and consider replacing the upstream O2 sensor.
Wrong they do increase mpg, I saw a 3 mpg increase when I installed mine and JP magazine also did a review of different intakes and found the average mpg increase was between 3-4 mpg.

1997 Jeep Cherokee 4.0 Automatic NP231
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post #13 of 25 Old 03-05-2010, 03:43 PM
4Slow9erHybrid
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Quote:
Originally Posted by subliminal View Post
Wrong they do increase mpg, I saw a 3 mpg increase when I installed mine and JP magazine also did a review of different intakes and found the average mpg increase was between 3-4 mpg.

1997 JGC Laredo 4.0 4x4 99900mi * 0W30 German Castrol since 75k * 225/75/R15 Firestone Destination AT on Ravine rims * winter 235/75/R15 Bridgestone Blizzak DM-V1 * UC suspension * Monroe Reflex Monotube shocks * factory skids * KOR steering brace * rear Addco SB * Magnaflow cat and cat back system * complete 5.9 interior
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post #14 of 25 Old 03-05-2010, 03:48 PM
subliminal
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Hey facts are facts I had had one on my trans am and also saw an increase in mpg, Are they the best intake for offroading? Probably not since water could be more easily sucked in and they will get dirty faster than the stock intake. But if youre mostly going to be driving on the street they do make a noticeable difference in mpg.

1997 Jeep Cherokee 4.0 Automatic NP231
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post #15 of 25 Old 03-05-2010, 04:03 PM
terryj
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The fastest way to increase you gas mileage is, believe it or not, change your air filter and your spark plugs.
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