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EcoJeeper 01-15-2008 12:19 AM

In a world where Jeeps get horrible gas mileage....
 
.... I drive one.


Hey all. I'm new to the community but looking forward to working with you guys on getting better gas mileage. I've been pretty impressed with the knowledge I've learned so far in reading various posts on the site. For one thing, I never knew how much difference little things could make in gas mileage numbers. Anyway, on to the vehicle.

I drive a 1994 Jeep Wrangler. It is the 4 cylinder 5 speed manual model with a soft top. I would like to get a hard top for it eventually both for looks and for a potential lessening of drag (I would just assume with the various little air gaps between the soft top and half doors that it would be worse for gas mileage than would a hard top with full doors). Anyway, it's got around 138,000 miles on it and still runs pretty good.

As you might guess by my driving a Jeep, I enjoy 4-wheeling tremendously. I've wanted a Jeep for about as long as I can remember and just recently got in a position to own one. I thought I was pretty much sunk as far as fuel economy was concerned until I found this site. Now I have a bit more hope for improving it (when I first bought the Jeep I was only getting around 13 mpg).

Thus far I've done some small stuff to the Jeep to see if it improves mileage. It needed an oil change when I bought it, and I have since changed it out with Mobil 1 Full Synthetic 5w-30 oil. I also folded my mirrors in, aired up my tires to 1 psi below max, put new plugs, wires, distributor cap and rotor in and only drive 55 on the highway. Still on my list of things to do are transmission fluid, transfer case fluid, differential fluid, air filter and fuel filter. I also have some ideas for some simple aero mods I can do to the Jeep (since I feel that is the vehicle's weakest point as far as fuel economy goes).

Anyway, expect some writeups from me in the future on how the various mods and maintainence have affected my gas mileage. Maybe my results will give others in similar boats hope for better mileage as well.

SVOboy 01-15-2008 12:21 AM

Hey there! Welcome to the site, don't forget to add your wrangler to the garage to make the info easier for all of us to access, :).

Thanks for stopping by, :turtle:

Stan 01-15-2008 10:28 AM

Welcome to Ecomudders! :D

A couple of years ago I stopped to fill up our TDi in Santa Cruz (on the coast west of San Jose), and a guy pulled up to the next pump with a diesel powered older soft-top Jeep (CJ-5?). We got to talking and he claimed 30 mpg on the highway at 55 with its VW 1.6L TD and (IIRC) a Toyota tranny with a super-tall 5th gear. Sorry, don't recall much additional detail.

On the aero side, be sure to read MetroMPG's thread on Autospeed article: adding a chin undertray to a 1st gen Prius. A 4wd Jeep has to be a lot "dirtier" than a Prius, so should have proportional benefits from cleaning up the airflow even a little.

LibbyMetro 01-15-2008 03:51 PM

wow ive never even heard of a wrangler getting that bad of mileage with the 4 banger, my neighbor used to have a 1990 with the 4 banger, and it got around 22-23 with the soft top, tune up should definitely help though

MetroMPG 01-15-2008 04:46 PM

Ecomudders. That's funny!

Welcome to the site.

First thing's first: set up a garage entry for your Jeep & start tracking your mileage in the Fuel Log. We know which way you want your fuel consumption graph to be trending. ("What graph," you ask? The one I'm going to be adding in a day or so.)

DifferentPointofView 01-15-2008 08:50 PM

Noice. Well, at least your not alone buddy. Technique for me is the key. I've tried various things to try and help it, but the 2 main things that I actually notice is driving technique, and always driving with a warm engine. And city driving is hell. Drive as much as possible without stop lights/signs, and you'll see a considerable improvement. If you drive, the best way is to try and stay in last gear. You can get it up. If I can with a 4.0L I6 in a ZJ, you can do it in a Jeep half it's size with a 4 banger.

EcoJeeper 01-15-2008 11:40 PM

Thanks for the kind words everyone! It's ironic, though, but now that I've posted this thread (and made my user account name) it seems as though my finances might dictate that I need to sell the Jeep soon. No worries, though. I'll still be around either way. I also own a 1996 Toyota Corolla that I've been implementing some of the gas-saving techniques with for a while (mirrors folded in, antenna down, tires aired up).

I'll keep you guys informed of what happens, but again, I really appreciate the warm welcome.

AndrewJ 01-15-2008 11:49 PM

Where are you from in Missouri? Springfield?

I was recently a Columbia resident.

SVOboy 01-15-2008 11:51 PM

Columbia is the best! Well, it's no chillicothe...

AndrewJ 01-16-2008 07:49 PM

mmm, just got my first and second favorite bbq sauces in the mail (with thanks to my parents) My second-fav is from Chillicothe, it's no Perry though...

SVOboy 01-16-2008 07:51 PM

There's still things made in chillicothe? I thought it was just a wal-mart now, :p

zjrog 04-19-2008 02:14 PM

Actually, when I was looking to buy my Neon... I noticed the 4 banger Wrangler only got a mile or so better than the 6. Both with th 5 speeds. I don't know what the 6 speed 6 cylinder gets though.

But you should be able to get better than 13...

I am always surprised how much Wranglers weigh...

mywifeskitty 04-19-2008 02:45 PM

i remember selling jeeps at a dealership in the mid 90's..... the epa rating on jeeps was ALWAYS only 1 or 2 mpg different for engines REGARDLESS of the vehicle.... IIRC the mpg was 15/19, 16/20, or 17/21 for the 8/6/4, regardless of whether or not it was a wrangler, cherokee, or grand...... i always found that weird... i'm guessing it's because all wranglers are 4x4

Red 04-19-2008 03:54 PM

Welcome to the site Ecojeeper. You should be getting atleast 20s out of your 4 popper. You have the 2.5 TBI one right?

consaka 03-19-2009 03:21 PM

Quote:

Originally Posted by EcoJeeper (Post 5455)
.... I drive one.

I drive a 1994 Jeep Wrangler. It is the 4 cylinder 5 speed manual model with a soft top. I would like to get a hard top for it eventually both for looks and for a potential lessening of drag (I would just assume with the various little air gaps between the soft top and half doors that it would be worse for gas mileage than would a hard top with full doors). Anyway, it's got around 138,000 miles on it and still runs pretty good.

Now I have a bit more hope for improving it (when I first bought the Jeep I was only getting around 13 mpg).

Well I dont feel so out of place then with my '93 suburban. while Im not trying to be an hypermiler thats not to say some of their techniques wont come in handy.
Looks to me like you need to start where I'm starting and find out why your mileage is so bad to begin with. This rig will be used to advertise our Preschool business and to pick up after school kids. Still I like to be as green as financially possible.
First thing was to figure out why 10 mpg. It also had a bad hesitation just off idle on acceleration and general mediocre performance. You'd think sucking that much gas that it would perform like a race car.
First mod was to get a laptop interfaced with the ECM so I could see what the engine is doing with what sensor data.
Second mod was to get a mileage computer on it so I can see the instant mpg.

I found out quick, thanks to the laptop, that my hesitation always came when the egr was coming on.. BUT the EGR circuit is working fine. Apparently this Year GM engines don't modulate the egr. It is either on or off. I haven't been able to find anything that says different. So now Im suspicious the CAT is plugged.
Anyway without a few pages of details im up to about 13mpg. but I will get better if I have to go electric on the front axle.. ;) 12 miles round trip to the school I should be able to do that with a few batteries. Expensive motors and controllers though.
Id say check your O2 sensor, check your EGR valve, and check your cat for airflow resistance. my mothers jeep gets 20-22 on the freeway so I am pretty sure you should be getting better then that.

askewguru 03-26-2009 08:38 AM

not to hijack the thread..........
consaka.........
a friend of mine had the same problem on almost the same year suburban....
drove him nuts, all sensors checked out ok, etc...........
his problem turned out to be the wrong sized tires............
apparantly the speed sensors on chevys the tire size will screw with stuff......
he went from 10mpg on the highway to almost 18-19 with putting on the stock sized tires........apparantly the last owner wanted "bigger" tires. Then sold it after his mileage went to crap. Check and see.......might be something simple!

consaka 03-26-2009 12:09 PM

Quote:

Originally Posted by askewguru (Post 94244)
not to hijack the thread..........
consaka.........
a friend of mine had the same problem on almost the same year suburban....
drove him nuts, all sensors checked out ok, etc...........
his problem turned out to be the wrong sized tires............
apparantly the speed sensors on chevys the tire size will screw with stuff......
he went from 10mpg on the highway to almost 18-19 with putting on the stock sized tires........apparantly the last owner wanted "bigger" tires. Then sold it after his mileage went to crap. Check and see.......might be something simple!

245/75R16 The tires are almost shot and I think one is turning into an egg but other then that they are LT tires so pump up to about 50 lbs. I run them pretty hard for better mpg. I notice that just a slight pedal difference seems to be the difference between 11mpg to 22mpg on the makeshift Mileage computer. I havent gotten the CAT off yet.. the darn thing is really stuck and ill have to use the sawsall on it. I really hate that. The Y pipe is kinda garbage too.


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