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Old 02-22-2012, 07:57 PM   #1
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Gas Mileage

I have all stock 1999 Wrangler Sport. i got it about a month ago and im only getting 10.9 mpg..is there anything i can do to make it better? and i know lifting it and putting bigger tires on it will make that worse. but its more than worth it!

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Old 02-22-2012, 09:12 PM   #2
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I get 20 mpg on my 06 4.0. 6 speed.

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Old 02-22-2012, 09:26 PM   #3
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You need to give it a full tune-up! Change the ft O2 sensor, and make sure your cat isnt clogged. There is no way a stock Wrangler should get that bad of gas milage. I average 15mpg in my Rubicon Unlimited (6spd ), and i havent done the 60k mile tune-up yet.
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Old 02-22-2012, 09:49 PM   #4
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I know your situation. I have a 97 4cyl. I average 9-10mpg. Tried everything except the cat.
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Old 02-23-2012, 06:01 AM   #5
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I know your situation. I have a 97 4cyl. I average 9-10mpg. Tried everything except the cat.
Wow....that's bad. I filled up yesterday. 17.6 mpg, 98 4cyl, 32s with only 28psi (I want my agressive tread tires to wear evenly) and it was all stop and go city miles...
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Old 02-23-2012, 08:49 AM   #6
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I have a 97 4.0 with 5 speed. 220,000 miles with stock size hwy tires

With hardtop on 19 to 20 mpg on open hwy driving 65 to 70

With softtop on 17 to 18 mpg on open highway 65 to 70

Over 70 the milage drops quickly,
60 or less you can add another 1 to 2 mpg

I only tune up when it's missing, usually a bad plug or wire
replaced O2 sensor once when engine light came on
original exhaust & cat.

I have been thinking about changing the 5 speed for 6 speed to increase mileage
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Old 02-23-2012, 09:09 AM   #7
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i find shifting to neutral saves gas, instead of pressing your break in traffic.
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Old 02-23-2012, 09:27 AM   #8
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Im getting 17.2 mpg in my 05 LJ 4.0 6sp. It has 40k on it. I wonder if I should change the spark plugs yet?

10.5 mpg sounds way off , I would check all mentioned above.
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Old 02-23-2012, 09:28 AM   #9
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Thanks yall. Its an automatic so ill try putting it in neutral at red lights. But yeah I knew 11 was really low, I'm just not sure why. Only one person owned it before me and just drove it like a regular car. And getting it tuned up sounds like a good idea also
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Old 02-23-2012, 09:30 AM   #10
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Btw it has 134k miles on it
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Old 02-23-2012, 09:36 AM   #11
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Quote:
Originally Posted by aksweatinghoney
i find shifting to neutral saves gas, instead of pressing your break in traffic.
The general rule is, if your not moving forward your losing gas mileage. This is where hypermiling(spelling?) comes into play. The goal is to modify your driving habits to the best possible efficiency.

Examples on how you can do this:
1) press in clutch when going down hills. Let gravity move you forward.
2) press in clutch when coming to a red light. I usually can travel 1/8 to 1/4 with the clutch in before I hit the red light. Many times the light turns green before I have to stop, so you can reuse the momentum to get back up to speed.
3) drive behind big rigs on the free way. Don't drive too close, but closer the better. Let them break up the wind in front of you, aerodynamics becomes much less important here. Myth busters got 40+ mpg out of a v8 dodge magnum doing this.
4) if waiting in the car for more than 30 seconds, turn off the engine. For example at a railroad crossing. In my area trains could take up to 5 minutes to pass.

I would like to see what others have done to hypermile(once again spelling?)
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Old 02-23-2012, 09:39 AM   #12
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1 and 2 don't apply to me since I have an automatic, but ill definatley try 3 and 4, thanks! And it also probably has something to do with the fact that I've only really gotten to drive it around town and to school, which is only about a 5 minute ride on a slow day
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Old 02-23-2012, 09:46 AM   #13
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I drive an 06, just under 60k miles on the clock, auto, 35's and 5:13s and heavily armored.
I get 10.5 consistently.
When it was brand new off the lot it only got 14.5.

I maintain it well, don't lead foot it very often and most of my trips are a primarily highway for the first 15-50 miles.
As far as I know, there is very little you can do to improve fuel efficiency other than as Green LJRub said, give it a good tune up including a new air filter. Whatever you do, don't buy into the whole cold air intake/tuner hype. They do little to nothing for the TJ.

Other than that just try to keep your foot out of it.
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Old 02-23-2012, 09:48 AM   #14
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Wow. Thats bad. I get between 18 and 19 on the hwy and im on 35's.
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Old 02-23-2012, 09:52 AM   #15
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1 and 2 don't apply to me since I have an automatic, but ill definatley try 3 and 4, thanks! And it also probably has something to do with the fact that I've only really gotten to drive it around town and to school, which is only about a 5 minute ride on a slow day
You just answered your question. All highway only gets me 18-19 (and thats driving no more than 65 in the truck lanes), all city is bad and I do even try to worry about. Do an all highway on a tank and you will know what it's capable of. Lots of Start ups Stop and Go is the worst case MPG.
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Old 02-23-2012, 09:54 AM   #16
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Agree with everything above... In addition , take your throttle body off, disassemble every thing, clean thoroughly, reassemble using new gaskets .. @ your high mileage this has probably never been done.. I'll be it's filthy.., good luck !!
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Old 02-23-2012, 12:34 PM   #17
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Has anyone done a pole to see if Tj's mileage varies from year to year?
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Old 02-23-2012, 12:40 PM   #18
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Have never done a pole at all. Afraid I'd slip and break my neck!

Haven't done any on mileage polls either!
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Old 02-23-2012, 12:43 PM   #19
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Agree with everything above... In addition , take your throttle body off, disassemble every thing, clean thoroughly, reassemble using new gaskets .. @ your high mileage this has probably never been done.. I'll be it's filthy.., good luck !!
I clean mine once a year. Never have disassembled it though. I just open 'er up, spray the heck out of it with TB cleaner and get in there and scrub really well all over (especially nooks and crannies and both sides of the butterfly) with a toothbrush. Followed by squirting it through as the engine is revved a bit to blow out all of the junk. It comes out nice and clean.
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Old 02-23-2012, 12:58 PM   #20
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Old 02-23-2012, 01:00 PM   #21
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Originally Posted by Kate

I clean mine once a year. Never have disassembled it though. I just open 'er up, spray the heck out of it with TB cleaner and get in there and scrub really well all over (especially nooks and crannies and both sides of the butterfly) with a toothbrush. Followed by squirting it through as the engine is revved a bit to blow out all of the junk. It comes out nice and clean.
These all sounds good, I just have no idea how to do what y'all are tlaking about, so does anyone want to clear that up for me? Lol
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Old 02-23-2012, 01:55 PM   #22
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Agree with everything above... In addition , take your throttle body off, disassemble every thing, clean thoroughly, reassemble using new gaskets .. @ your high mileage this has probably never been done.. I'll be it's filthy.., good luck !!
I agree, I have a 97 4.0 with 165,000 and after reading a thread I decided to clean my IAC. I noticed that when breaking, while in neutral, my idle would dip down and shoot back up a few times before it leveled out. After pulling out my IAC valve I could see why my idle was fluctuating. The piston was covered in gunk and I guess the computer didn't know exactly where to position it for the correct idle. Anyways, after I cleaned it and reinstalled I could really tell a difference. The idle is more stable now and the rpm's shoot down a lot quicker that before. I would like to think that it is saving me 1 mpg.

I didn't have time to do an entire clean of the throttle body, but I will do the whole thing when I have time.
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Old 02-23-2012, 01:57 PM   #23
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Old 02-23-2012, 03:52 PM   #24
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I just remembered that the place I bought my jeep warrantied it for 3 months and its only been a month since I bought it, so hopefully they can do something, if not then ill definatley try out cleaning my throttle body or IAC
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Old 02-23-2012, 04:04 PM   #25
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What kind of speed are you doing? I usually sit on the highway at about 75-80 and I get 10ish to a gal... When I sit around 65ish I get 15 to a gal... The one good thing is, I work on a yacht so I drive my jeep under 8K a year...
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Old 02-23-2012, 04:48 PM   #26
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Yikes, 75 or 80? You must really go through jeeps.. They just aren't designed for much over 70... I believe mine might have seen 72, once or twice, But you fuel mileage is correct, once you're traveling faster than 62 to 65 mph your mpg falls off a cliff..
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Old 02-23-2012, 06:10 PM   #27
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What kind of speed are you doing? I usually sit on the highway at about 75-80 and I get 10ish to a gal... When I sit around 65ish I get 15 to a gal... The one good thing is, I work on a yacht so I drive my jeep under 8K a year...
Wow!!! Yeah I don't know that I've ever even had mine to 70. Avg 55-65 on intertate tops. It's a Jeep, if I want to travel at those speeds I take my wifes Avalon.
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Old 02-23-2012, 08:26 PM   #28
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What kind of speed are you doing? I usually sit on the highway at about 75-80 and I get 10ish to a gal... When I sit around 65ish I get 15 to a gal... The one good thing is, I work on a yacht so I drive my jeep under 8K a year...
the fastest i usually drive is 55 on the way to school and on the way to anywhere really, but i never have the need to go on the highway or freeway.
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Old 02-24-2012, 01:32 AM   #29
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I have always had big trucks and I have a lead foot too, but my jeep runs great with no problems. She a happy jeep at those speeds, and she just purrs along the highway.
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Old 02-24-2012, 01:58 AM   #30
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try getting a CAI

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