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Topic Review (Newest First)
07-03-2012 10:32 PM
99er I have a 99 with 4.0L and 5 speed with 95k miles. On the highway I get about 18. I towed my 15 foot cargo trailer over a 5,000 pass this weekend and got 12.3 mpg. It really does matter how and where you drive.
03-09-2012 11:12 AM
Allstar Realtor I got right at 18mpg on my 99 4.0l w/ auto, hardtop & 31's around town the last time i checked. I went 247 miles on that tank according to my gps.
03-09-2012 10:15 AM
Jonny15 I get between 17-18 average with 70% highway 30% city dtiving in my 06 4.0 rubi. One thing you have to remember too is that if your speedometor is off, you're mpg will be too.
03-09-2012 10:02 AM
MountainRoad I have a 99 TJ with 140K. I get between 17 - 19 mpg depending on how much highway I get.

I also almost never go above 65.

I do 70 occasionally but only when behind a big rig. I have a soft top and you can really tell a difference when you get behind a big rig. I probably have annoyed a few truck drivers so far, but hey gas is expensive ...
03-09-2012 12:40 AM
turnstyle Shoot, my Jeep hit 70+ on my first test drive. Most of my commute is 40-55 mph country roads with a bit of stop and go on one end of the commute. I do get on it pretty good but, I am still averaging over 15 mph with a 4.0 6 spd. @ 45K.

I hope you are able to fix your mileage woes soon.
03-08-2012 09:57 PM
Rooster21 I just picked up a 97 2.5 auto... Put a set of 31s on it with no lift.. Tires only measured out around 29 inches... Check my milage after driving some hwy and city combined and was averaging around 14-15... This is with a cracked manifold and needs a tune up.. Planning on a Tune up, change fluid in tranny and fresh lube in differentials.. This should give me a little more along with a smoother running engine..

For those getting bad milage, make sure your speedo is correct and try to use same gas pump pointing in same direction.. Always use trip meter, never try to use fuel guage when figuring.. Mile Markers are the best way.. I always heard 31s make your milage off around 8-10 %... When I go a mile on freeway, my trip always says .9 everytime..
03-08-2012 09:38 PM
dillinghamte2 I have to agree with KenG, I have a 97 4.0L auto, did all the tune up new plugs wires cap rotor and I get about 120-130 to a tank. That is to work and back apx 14 miles no big open roads on the way but owning a Jeep is cool, wish I had bought one years ago...next new ride will be another Jeep
02-25-2012 10:14 AM
techflork
Quote:
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.
you and I both. I don't mean to drive it at 75-80. Hell once I hit 90 but I didn't know it. It just barely starts to vibrate. It drives like normal at 80. At anyrate I drove 65-70ish last time on a two hour trip on the highway. Got much better gas milage
02-25-2012 10:03 AM
KenG I also have a 99TJ with auto. 3.73 gears, 31x10.5 bfg's, next month going to 32x11.5's. I can sweek out 240 miles on a tank, highway driving and get about 120 miles out of a tank in town. Thats running it down to empty. Ive done the tune up, and cleaning with no avail. Remember, its a JEEP. The 3 spd autos will always get poor milage over the standards. The poor milage is always out wieghed by the coolness of being a JEEP owner.
02-24-2012 11:05 PM
Wyominer Start with a tune-up. Change your spark plugs (I used XP985's), rotor, cap and wires. Consider changing your engine oil, transfer case and diff. oils over to full synthetic. Have your transmission flushed (I have mine flushed by a professional). Consider a Sea Foam treatment to clean your fuel injectors, also clean your throttle body as stated above. Later this spring, flush your cooling system (Won't really effect mileage, but probably needs done.)

You should be able to easily do all these yourself with basic tools. This forum and Stu Olson's will have write-up's on how to do all of the above if you need them. Good luck, and enjoy your Jeep!
02-24-2012 01:58 AM
gamaya3 try getting a CAI
02-24-2012 01:32 AM
blue6tj 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.
02-23-2012 08:26 PM
Merc73
Quote:
Originally Posted by blue6tj View Post
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.
02-23-2012 06:10 PM
kshaws21
Quote:
Originally Posted by blue6tj
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.
02-23-2012 04:48 PM
Rubicondon53 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..
02-23-2012 04:04 PM
blue6tj 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...
02-23-2012 03:52 PM
Merc73 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
02-23-2012 01:57 PM
Knowledge97 This is the thread that I looked at (Cleaning IAC and Throttle body write up (for dummies) - JeepForum.com).
02-23-2012 01:55 PM
Knowledge97
Quote:
Originally Posted by Rubicondon53 View Post
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.
02-23-2012 01:00 PM
Merc73
Quote:
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
02-23-2012 12:58 PM
Merc73 .
02-23-2012 12:43 PM
Kate
Quote:
Originally Posted by Rubicondon53 View Post
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.
02-23-2012 12:40 PM
Kate Have never done a pole at all. Afraid I'd slip and break my neck!

Haven't done any on mileage polls either!
02-23-2012 12:34 PM
crallscars Has anyone done a pole to see if Tj's mileage varies from year to year?
02-23-2012 09:54 AM
Rubicondon53 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 !!
02-23-2012 09:52 AM
Atthehop
Quote:
Originally Posted by Merc73 View Post
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.
02-23-2012 09:48 AM
XJTJ Wow. Thats bad. I get between 18 and 19 on the hwy and im on 35's.
02-23-2012 09:46 AM
Kate 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.
02-23-2012 09:39 AM
Merc73 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
02-23-2012 09:36 AM
Rpkittle
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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