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Old 06-21-2013, 10:27 AM   #1
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Better gas mileage

Just bought a 2001 Yellow Jeep Wrangler Sport. It has a 4" lift with 33x12.5's, 6" fender flares and aftermarket bumpers front and rear. It currently has the factory gears in it 3.73 and i want to get it running back to factory RPM's down the highway. It's only getting 13.4 MPG...... What gears do i need to make this happen? Oh and it has a 4.0 5 speed. Any other suggestions to help with the mileage?

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Old 06-21-2013, 10:39 AM   #2
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4.56 gears will get you back pretty close to the stock setup. Here is a website you can play with and get some ideas of what size gears would do what.

Gear Ratio Calculator

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Old 06-21-2013, 11:06 AM   #3
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Quote:
Originally Posted by BDGreer46 View Post
Just bought a 2001 Yellow Jeep Wrangler Sport. It has a 4" lift with 33x12.5's, 6" fender flares and aftermarket bumpers front and rear. It currently has the factory gears in it 3.73 and i want to get it running back to factory RPM's down the highway. It's only getting 13.4 MPG...... What gears do i need to make this happen? Oh and it has a 4.0 5 speed. Any other suggestions to help with the mileage?
First question is how are you calculating you mileage (and no offence) there have been a number of threads lately and a lot do not know how.

- How are you reading miles traveled? If you are using your odometer has it been corrected for the 33" tires? If not it is off and reading low.

- Fill the tank.
- Reset the odometer if it is correct or use a GPS.
- Run the tank however far. Does not have to be to E but enough to get a good average.
- Fill the tank
- Divide the miles driven by the amount of fuel put in.
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Old 06-25-2013, 11:59 AM   #4
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Surely someone has more suggestions to get better mileage.....
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Old 06-25-2013, 12:28 PM   #5
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How many miles are on the Jeep?

Jeeps are shaped like a commercial refrigerator so the aerodynamics will keep the gas mileage down. Also the lift, heavy tires, after market bumpers and bigger fenders are adding weight also.

Best cheap things to do that can help in a small way but its better than nothing:

*Get all the maintenance up to date.
*Change 02's if needed.
*Tune up if needed
*Keep the tires properly inflated properly (higher psi reduces roll resistance but can wear tires faster so look for a balance)
*Light on the gas pedal when driving.
*Maintain oil changes
*Check all fluids since you just brought the Jeep and change if needed.
*Check the air filter and change if dirty
*Have the alignment checked
*Reduce weight (remove back seats if you don't need them for example)
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Old 06-25-2013, 12:34 PM   #6
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Quote:
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Surely someone has more suggestions to get better mileage.....
Buy a vehicle that is more aerodynamic then a brick. Your driving a heavy brick thats lifted with over sized tires. As stated regearing to (with your set up) 4.56 will help. Other then that? Remove the lift and go back to stock suspension and stock tire size.

Look around: https://www.google.com/search?q=bett...9ab4fc1c232dcc
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Old 06-25-2013, 12:40 PM   #7
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If you havent done it already. New air filter, spark plugs, new boots wouldnt hurt.
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Old 06-25-2013, 12:41 PM   #8
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I really wish people would do there homework before buying a jeep.
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Old 06-25-2013, 12:59 PM   #9
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He is asking how to get better gas mileage out of a jeep not 40mpg but something better than 13.5mpg which is reasonable. On newer jeeps like these it will be hard to get good gas mileage because they don't offer a lot to help improve gas mileage. the best you can do is install a better air intake/filter do a tune-up with good quality plugs and coil pack. you can also install an electric fan to help reduce drag on the engine. I haven't seen anything to improve the ignition system on these newer jeeps that is really worth anything like the accel ignition kits that you could get for the YJ's. Also most people don't change the sensors in their older vehicles i.e. O2 sensor and map/maf sensor and also the catalytic converter should be changed if its over 100,000 miles. I did everything above on a 94 YJ that I had and went from getting 16mpg to 24mpg and I was running a 6" lift and 33's.
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Old 06-25-2013, 01:08 PM   #10
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Drive by home depot and hire some people to push it.
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Old 06-25-2013, 01:17 PM   #11
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I have 2 different TJ's one is a 98 with 4.5 lift and 4.56 gears it gets 15mpg on a good day. The other is a 02 5" lift with 3.73 gears it gets 15mpg, so take your pick. When the 98 was almost stock I got 19mpg not any more. It's a Jeep just fill it up and be happy.

The 4.56 gears made a world of difference on power and the manners of the Jeep. I highly recommend.

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Old 06-25-2013, 01:56 PM   #12
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Quote:
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Surely someone has more suggestions to get better mileage.....

Again, not meaning to offend but how are you calculating 13.4 mpg?
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Old 06-25-2013, 02:12 PM   #13
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Quote:
Originally Posted by BDGreer46 View Post
Just bought a 2001 Yellow Jeep Wrangler Sport. It has a 4" lift with 33x12.5's, 6" fender flares and aftermarket bumpers front and rear. It currently has the factory gears in it 3.73 and i want to get it running back to factory RPM's down the highway. It's only getting 13.4 MPG...... What gears do i need to make this happen? Oh and it has a 4.0 5 speed. Any other suggestions to help with the mileage?
I can get 18/19 in my Rubicon with 33x10.5 BFG/AT and 4.10 gears. (Let the hazing begin) I have learned that everything ninjaturtle0 was saying and early shifting, shift at 2000 rpm and cruse control helps quite a bit.

Don't use cruise control going up hills it wastes gas as it tries to keep the jeep within a 5MPH range so going up a hill it will keep the pedal floored to keep it at 65.
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Old 06-25-2013, 02:21 PM   #14
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Just got my Rubicon, 3.5 lift-33X 12.5x15 Duratracs, Auto---17 mpg and I was very happy with that.
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Old 06-25-2013, 02:44 PM   #15
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Surely someone has more suggestions to get better mileage.....


I wish I had a dollar for every "how can I get better mpg" thread.
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Old 06-25-2013, 02:47 PM   #16
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I wish i had a dollar for every "how can i get better mpg" thread.
+1
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Old 06-25-2013, 03:24 PM   #17
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I wish I had a dollar for every "how can I get better mpg" thread.
We'd all be able to fill our tanks weekly!
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Old 06-25-2013, 03:27 PM   #18
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I wish i had a dollar for every "how can i get better mpg" thread.
x2
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Old 06-25-2013, 03:28 PM   #19
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We'd all be able to fill our tanks weekly!
Got laid off last year went from filling my tank every 3 days to once a month. Cannot go far knowing you cannot afford gas. I hope we start getting the money soon. LOL
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Old 06-25-2013, 03:46 PM   #20
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Going to 4.56 gears with your set up will make a big difference. The 4.0 isn't the most efficient engine around but getting it back into it's best torque/power/efficiency rpm range really helps. It will make the Jeep much nicer to drive both on-road and off-road also.
Make sure you re-gear the speedo too.
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Old 06-25-2013, 06:52 PM   #21
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Is the speedo regeared for the larger tires? Honestly, your driving a a brick on wheels with a tractor engine, if you get over 16 be happy.
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Old 06-25-2013, 10:35 PM   #22
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Your drive jeep man bad mpg is something to brag about...like my jeep wastes more gas then your Prius saves
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Old 06-26-2013, 12:11 AM   #23
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I've read many threads on this and have to agree with people needing to know what they are buying...in reality I am getting the same mpgs as my volvo and barely getting less mpgs than my diesel liberty (but diesel is more money than gas). You buy a Jeep for specific reasons...enjoy it.
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Old 06-26-2013, 12:11 AM   #24
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your drive jeep man bad mpg is something to brag about...like my jeep wastes more gas then your prius saves
x2
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Old 06-26-2013, 10:05 AM   #25
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For those of you that provided useful feedback. Thank you very much!!
For the rest....well let's just say maybe you should find something different to do with your time......
I am new to this forum and think maybe i should find a different one....
All i can say is unbelievable.
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Old 06-26-2013, 10:17 AM   #26
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I bought a stock '97 Wrangler with 60k miles about six weeks ago. I was expecting mileage to be around 15mpg based on what I've read. I'm actually getting a little over 18mpg combined. I had a Chev S10 with a 4.3 liter HO motor and 2wd that got worse mileage. I'm very happy with what the Jeep is delivering. You can't really expect much better with a 4+ liter 6 cylinder push rod motor as both vehicles have.
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Old 06-26-2013, 10:25 AM   #27
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I just now decided to calculate my mileage a couple days ago and I did exactly as was stated above. Filled it up (put about 6 gallons which got me to 1/2), drove it like I normally would and then when it was time to fill up, I filled it back to 1/2 way putting 6 gallons in and then divided that by the amount of total miles driven (75). IF I did my math right, I'm getting 12.5 MPG with my set up.

Would I like to get better gas mileage? Sure
Did I buy a Jeep to save on gas? No, not really but it's getting better MPG than my truck did.

When I first drove the Jeep home after buying it, I used a GPS to get home and the speedo said I was doing the exact same speed as the GPS (maybe one under compared to the GPS). I assume this means the speedo has been regeared?

Info is on my profile, anything I can do to improve gas mileage a bit?

Sorry to hijack the thread, didn't want to start another one of these threads so I thought I would just contribute...
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Old 06-26-2013, 10:46 AM   #28
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For those of you that provided useful feedback. Thank you very much!!
For the rest....well let's just say maybe you should find something different to do with your time......
I am new to this forum and think maybe i should find a different one....
All i can say is unbelievable.
You had good info given to you in the 2 first post. You even had one person asking you questions to try and help you out more. And your response was
Quote:
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Surely someone has more suggestions to get better mileage.....
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Old 06-26-2013, 10:56 AM   #29
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.............and STILL have not detailed how 13.4 was calculated. The 13.4 can very well be incorrect....................and you may be getting better mileage than you think.......or if the speedometer has been corrected for the tires............
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Old 06-26-2013, 10:57 AM   #30
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For those of you that provided useful feedback. Thank you very much!!
For the rest....well let's just say maybe you should find something different to do with your time......
I am new to this forum and think maybe i should find a different one....
All i can say is unbelievable.
I have noticed that most forums have a search feature. I know this one does. Try using it. The MPG question gets about as old as the "Why don't jk owners wave at me" threads. You can typically get all the info you could possibly imagine by using the search feature. If you still can't get the info you are looking for ask your question. There are some very knowledgeable people on this forum, but they are not likely to chime in on this question that gets asked 10 times a week.

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