Gas mileage - JeepForum.com
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post #1 of 22 Old 08-21-2019, 08:52 AM Thread Starter
Cain5683
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Gas mileage

Can someone help me figure out how to get better gas mileage on my 97 tj 4.0 i6 I'm looking for modifications and everything

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post #2 of 22 Old 08-22-2019, 09:48 AM
TJnBC
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Buy a Prius....

Seriously though, unless you are running a bone stock TJ with stock gearing/tires/no lift, your mileage will suffer as you build UP and add aftermarket items. They are a box on wheels.
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post #3 of 22 Old 08-22-2019, 10:32 AM
mukluk
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  1. Drive slower -- aerodynamic drag is the biggest influence on power required to move a vehicle above roughly 25mph.
  2. Make the Jeep lighter -- excess weight requires more power to accelerate and go up hills.
  3. Decrease rolling resistance by using narrower tires at higher inflation pressure.
  4. Keep the engine in its power band by shifting appropriately and regearing the differentials as required if tire size has been altered.
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post #4 of 22 Old 08-22-2019, 10:34 AM
Ironhead
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what is your current mpg?

when was the last time the jeep had a tune up?
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post #5 of 22 Old 08-22-2019, 10:51 AM
Jimwfl
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My 97 TJ 2.5 pretty much stock gets 18mpg. What are you getting?
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post #6 of 22 Old 08-22-2019, 11:36 AM Thread Starter
Cain5683
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Quote:
Originally Posted by Ironhead View Post
what is your current mpg?

when was the last time the jeep had a tune up?
11-13 mpg and probably about 9 months.


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post #7 of 22 Old 08-22-2019, 11:37 AM Thread Starter
Cain5683
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Originally Posted by Jimwfl View Post
My 97 TJ 2.5 pretty much stock gets 18mpg. What are you getting?
11-13 to the gal


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post #8 of 22 Old 08-22-2019, 11:37 AM
gsindela
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I don't mean to sound like a jerk. But if mileage is a main concern, I've said before, perhaps a TJ is the wrong vehicle for you. Perhaps you can buy a used econo-car for daily driving and save the TJ for fun?

Reminds me of a true story I heard of a guy that was buying a luxury yacht and was concerned about the MPG's. Just doesn't jive.

Other than that, I would echo what mukluk and Ironhead have already said.

FYI, I have an '03 Model X with the inline 6 running a manual transmission with 33's and 4.56 gears. I get around 13.5 MPG in nearly all around town driving. Do I like that? Of course not. But for me the pro's of driving my TJ far outweigh the con's.
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post #9 of 22 Old 08-22-2019, 11:38 AM
gsindela
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Originally Posted by Cain5683 View Post
11-13 to the gal


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Yeah: that is obviously not good. But, not out of the range of what others have seen, unfortunately.
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post #10 of 22 Old 08-22-2019, 11:48 AM
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IIRC the MPG specs for the 97 auto 4.0l is 13 city 16 Hwy

Is yours stock, any modification done, larger tires??
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post #11 of 22 Old 08-24-2019, 06:53 PM
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Wish I knew
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post #12 of 22 Old 08-24-2019, 08:00 PM
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You need a hybrid Jeep.
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post #13 of 22 Old 09-02-2019, 09:05 AM
Ross
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I do don't understand this response, if you want better mileage you should by a Prius.

It is like if you wanted lockers you should have bought a Rubicon.

It has all been addressed already,

Lighten up, less aggressive tires, proper air pressure, tune up, easy on the right foot, run it in the right rpm range(2200 to 2400), regear if you can't if you went with larger tires. NO roof rack's

I went from the 12s to 15s just buy going from an aggressive mud tire to an AT tire.

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post #14 of 22 Old 09-02-2019, 09:50 AM
222Doc
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tire size over stock is main MPG killer. only way to gain some back for larger tires is gears. Cant tune your way or cold air your way. Like we never did back in the day ask Sammy, drive 55. there is a reason they picked 55mph as the max speed anywhere in the country. its about the break point of when air flow adds up a lot. even boxs can get fairly good mpg.

larger tires>gears then well not on a 4.0, but tunes on some things can do a lot. but only after gears is worth doing the rest and its gain is marginal compared to what gears will do for most.

or buy a Prius.

The hybrid Jeep they do make now the JL 4 banger. Worst execution of the system on a vehicle i have ever seen. Especial for its application if used off road. There is a serious issue with where and how they placed the Litho pack. If say it was placed in my JK the same way. It would have ruptured the litho cell pack and they have caught on fire already and not even off road. Look at the battery really well. then think what would happen say if that got packed with mud? it has a cooling system. to much that could go wrong and if it does tends to get real hot catch fire then the gas tank is right next to that its plastic....... Battery should have been above frame and for off road with the weight of a JK would need at least 1/4 plate to keep the battery from being crushed off road. Well done Fiat....

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post #15 of 22 Old 09-02-2019, 04:09 PM
Hbromberg
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200 miles per tank, regardless for me it seems

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