getting 12 mpg in my 2013 JKU need help - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > General Tech Forums > General Jeep Discussion

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 08-04-2013, 05:01 PM   #1
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
getting 12 mpg in my 2013 JKU need help

i just purchased my jeep wrAngler unlimited last month and im only getting 12 mpg combined is that normal???
i have 18" kmc addict wheels with hankook dynapro M/T LT275/65R18
Attached Thumbnails
Click image for larger version

Name:	image-301107192.jpg
Views:	237
Size:	183.2 KB
ID:	281534  

redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 05:06 PM   #2
Jeeper
 
Ruby Tuesday's Avatar
 
Join Date: Jul 2012
Location: New Mexico
Posts: 771
That seems low to me, a lot depends on how you drive and driving conditions. I easly get 17mpg mixed driving.

Ruby Tuesday is offline   Quote Quick Reply
Old 08-04-2013, 05:09 PM   #3
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
i dont have a heavy foot so i dont know why its getting so low mpg's
do you think the tires are the problem of the mpgs
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 05:15 PM   #4
Jeeper

WF Supporting Member
 
O_M_Jeep's Avatar
 
Join Date: Aug 2011
Location: South Central Wyoming
Posts: 849
lol, MPG in a lifted Jeep

I love these threads
__________________
There are a million ways to build a jeep, pick one and do it - you bought a canvas, not a painting!

Click here to support Wranglerforum
Or else the teddy bear gets it
O_M_Jeep is offline   Quote Quick Reply
Old 08-04-2013, 05:16 PM   #5
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by O_M_Jeep View Post
lol, MPG in a lifted Jeep

I love these threads
mine is not lifted ??
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 05:25 PM   #6
Jeeper
 
lolpetewtf's Avatar
 
Join Date: Jan 2012
Location: Sudbury, MA
Posts: 1,941
Do you have 4.10s?
__________________
2012 Cosmos Blue JK
Galaxy DX-99v2/Sirio 5000

S Package/Auto/Dual Top
Custom Stereo/20% Tint
lolpetewtf is offline   Quote Quick Reply
Old 08-04-2013, 05:26 PM   #7
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by lolpetewtf View Post
Do you have 4.10s?
What is 4.10s ? im new to jeeps everything is bone stock except wheels
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 06:13 PM   #8
rotaredoM

WF Supporting Member
::WF Moderator::
 
panthermark's Avatar
 
Join Date: Aug 2011
Location: Chicago-land
Posts: 8,972
Images: 13
It's kinda late now, but 1st time wrangler owners should be required to spend 90 days on the this forum before even being allowed to go near a dealership.

1st, if that is not a Rubicon....you should remove the sticker. In your earlier pic, there are no rockrails or side steps on it (Rubi's come with rockrails), nor a Rubi sticker. And in the pic in this thread, there are now side steps on it.

It looks like you went to wider (and probably heavier) tires. It would be good to know your axle ratio....and from first glance, you wheels look taller than 32's....but the size you listed is for 32's. If they are indeed taller, was your speedo recalculated?
__________________
2013 Sahara Unlimited
Billet - Auto - 3.73 - Connectivity - Painted Hardtop - LSD - Remote Start - Saddle Leather - Side Airbags

I may mall crawl...but I look good doing it.....
panthermark is offline   Quote Quick Reply
Old 08-04-2013, 07:36 PM   #9
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by panthermark View Post
It's kinda late now, but 1st time wrangler owners should be required to spend 90 days on the this forum before even being allowed to go near a dealership.

1st, if that is not a Rubicon....you should remove the sticker. In your earlier pic, there are no rockrails or side steps on it (Rubi's come with rockrails), nor a Rubi sticker. And in the pic in this thread, there are now side steps on it.

It looks like you went to wider (and probably heavier) tires. It would be good to know your axle ratio....and from first glance, you wheels look taller than 32's....but the size you listed is for 32's. If they are indeed taller, was your speedo recalculated?
..
i started this thread for help if your not gona help mind your own business if its a rubicon or a sport i bought mine cash so i can do whatever i want to it ✌
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 07:48 PM   #10
Jeeper
 
Slowdad's Avatar
 
Join Date: Jun 2011
Location: Utah
Posts: 41
Haha...it's your jeep do whatever you want...

As for mpg's...that sounds really low. Are you checking mpg via the inboard computer or by calculating actual number of miles driven. I've got 37's and get 17+.

The 4.10 question was to understand what you gear ratio is. Are you driving flat areas or mountains.
Slowdad is offline   Quote Quick Reply
Old 08-04-2013, 07:55 PM   #11
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by Slowdad View Post
Haha...it's your jeep do whatever you want...

As for mpg's...that sounds really low. Are you checking mpg via the inboard computer or by calculating actual number of miles driven. I've got 37's and get 17+.

The 4.10 question was to understand what you gear ratio is. Are you driving flat areas or mountains.
im calculating it by #s and i mostly drive it in flat areas .. it seems way too low so i had to ask
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 08:04 PM   #12
The Jeep Life.

WF Supporting Member
 
Cdwright's Avatar
 
Join Date: Mar 2013
Posts: 878
Quote:
Originally Posted by redrockculichi View Post

im calculating it by #s and i mostly drive it in flat areas .. it seems way too low so i had to ask
If the tires are not stock and you did not recalibrate for them, it might be affecting it.

I have close to the same tires as you but mine were stock and came calibrated from the factory. I also have the 4.10 gears. I get 15.
Cdwright is offline   Quote Quick Reply
Old 08-04-2013, 08:10 PM   #13
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by Cdwright View Post

If the tires are not stock and you did not recalibrate for them, it might be affecting it.

I have close to the same tires as you but mine were stock and came calibrated from the factory. I also have the 4.10 gears. I get 15.
when you say calibrated what do you mean ?
i bought my wheels from jeep they balanced them
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 08:12 PM   #14
Jeeper
 
simdps's Avatar
 
Join Date: Aug 2013
Posts: 44
Quadratec has a Superchips Flashcal. That will help. Then I get a cold air intake it gave me 4.8 mil a gallon. The Superchips will help with your tires side too. Have fun .
simdps is offline   Quote Quick Reply
Old 08-04-2013, 08:22 PM   #15
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by simdps View Post
Quadratec has a Superchips Flashcal. That will help. Then I get a cold air intake it gave me 4.8 mil a gallon. The Superchips will help with your tires side too. Have fun .
Ok thanks i will look into it
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 08:29 PM   #16
The Jeep Life.

WF Supporting Member
 
Cdwright's Avatar
 
Join Date: Mar 2013
Posts: 878
Quote:
Originally Posted by redrockculichi View Post

when you say calibrated what do you mean ?
i bought my wheels from jeep they balanced them
Sure, but the rolling diameter might have changed.
Cdwright is offline   Quote Quick Reply
Old 08-04-2013, 08:41 PM   #17
Jeeper
 
Ruby Tuesday's Avatar
 
Join Date: Jul 2012
Location: New Mexico
Posts: 771
If you did not recalibrate your speedo to match your tire size your MPG, MPH and odometer will all be off. If its an auto your shift points will also be off. Look into buying a " ProCal" much cheaper than a flash cal.
Ruby Tuesday is offline   Quote Quick Reply
Old 08-04-2013, 08:56 PM   #18
Jeeper
 
Join Date: Dec 2010
Posts: 496
Quote:
Originally Posted by redrockculichi View Post
i just purchased my jeep wrAngler unlimited last month and im only getting 12 mpg combined is that normal???
i have 18" kmc addict wheels with hankook dynapro M/T LT275/65R18
I get 14 mpg combined with my 2013 JKU, with 35" Goodyear MTR/K tires, ... and a 6.4 Hemi under the hood. But, I have to run premium unleaded.
__________________
2014 Wrangler Sport
MOPWR2U is offline   Quote Quick Reply
Old 08-04-2013, 09:03 PM   #19
Jeeper

WF Supporting Member
 
O_M_Jeep's Avatar
 
Join Date: Aug 2011
Location: South Central Wyoming
Posts: 849
Quote:
Originally Posted by redrockculichi View Post
..
i started this thread for help if your not gona help mind your own business if its a rubicon or a sport i bought mine cash so i can do whatever i want to it ✌
Yes, it's your Jeep and you can do whatever you want to it, but it also helps to not be a d*ck to people your asking for help.

If it's a Rubicon, fine, those people who KNOW something about your Jeep would know IF IT'S A RUBICON what the gearing is and what the drivetrain is, if it's a sport you put poser rubi stickers on, then all that changes, and yes, they need to know to help.

What they meant by calibrate is, when you put big tires on it (thereby lifting it, like I said), if you didn't change the computer to know that you bought big-ass tires, then your computer still thinks your doing 30 MPH when your actually doing 35.
__________________
There are a million ways to build a jeep, pick one and do it - you bought a canvas, not a painting!

Click here to support Wranglerforum
Or else the teddy bear gets it
O_M_Jeep is offline   Quote Quick Reply
Old 08-04-2013, 10:05 PM   #20
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by O_M_Jeep View Post

Yes, it's your Jeep and you can do whatever you want to it, but it also helps to not be a d*ck to people your asking for help.

If it's a Rubicon, fine, those people who KNOW something about your Jeep would know IF IT'S A RUBICON what the gearing is and what the drivetrain is, if it's a sport you put poser rubi stickers on, then all that changes, and yes, they need to know to help.

What they meant by calibrate is, when you put big tires on it (thereby lifting it, like I said), if you didn't change the computer to know that you bought big-ass tires, then your computer still thinks your doing 30 MPH when your actually doing 35.
dude your the one came out talking about -1st take off the rubicon sticker im not a dl@k to anyone i just talk to people how they come at me .. thanks for your help im just trying to see why the hell my jeep is getting low miles when i know alot of people that have 32s tires and getting around 16-17 the only difference is that i have Mud terrain tires and i mostly drive on the road lol
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 10:05 PM   #21
Jeeper
 
Lando25's Avatar
 
Join Date: Feb 2011
Location: Southern Minnesota
Posts: 1,047
What tire size, what axle ratio (look at your axle for a tag), what transmission and finally any engine codes?
__________________
sic vis pacem para bellum
OlllllllO
Lando25 is offline   Quote Quick Reply
Old 08-04-2013, 10:13 PM   #22
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by Lando25 View Post
What tire size, what axle ratio (look at your axle for a tag), what transmission and finally any engine codes?
tire size LT275/65 R18
axle ratio 3.21
5 speed auto transmission
no engine codes
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 10:22 PM   #23
Jeeper
 
Lando25's Avatar
 
Join Date: Feb 2011
Location: Southern Minnesota
Posts: 1,047
I don't drive a JK, but 3.21 seems a little inadaquite for 32s. Do you drive at a lot of highway speeds? You could try turning your overdrive off if you motor is lugging.
__________________
sic vis pacem para bellum
OlllllllO
Lando25 is offline   Quote Quick Reply
Old 08-04-2013, 10:31 PM   #24
I Am JD & It's My Dream

WF Supporting Member
::WF Administrator::
 
JDsDream's Avatar
 
Join Date: Jan 2009
Location: The Peach State
Posts: 26,745
Images: 4
I'm not a JK owner but I will give you some basics that apply to all Jeeps. First they are rolling bricks. The aerodynamics...well there are none.

Your mileage can have many variables. You are new to this and if like me, when I first got my Jeep, I tried to drive it the way I drove my car. Once you settle in and you adjust your driving style, you will see an increase in mileage.

As mentioned above, when you increase the tire size, it throws everything else off as far as mileage is concerned. Your computer registers rotation of the tires at their stock size. Obviously a larger tire is going to travel a farther distance per rotation. It isn't much, but it makes a difference. This is why many people have their speedos recalibrated when they increase the tire size.

If you have a GPS that shows mileage, you can use that to compare the varience in what your odometer reads.

Top configurations, (topless, hardtop, soft top) and load will also have an effect.

I would suggest that you keep tabs of your mileage by setting your tripometer to 0 when you fill up and dividing that number by the number of gallons required to refill. This will at least give you a more accurate idea of how far you can go on a full tank.

Give it some time and I think that you will see a change for the better.
__________________
The kind of woman that when my feet hit the floor each morning the devil says "Oh Crap, She's up!"

To All Of Our Forum Veterans and Active Service Members.
Our Debt To You Is Greater Than We Could Ever Repay.
Thank You

Become a Supporting Member!
JDsDream is offline   Quote Quick Reply
Old 08-04-2013, 10:42 PM   #25
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by Lando25 View Post
I don't drive a JK, but 3.21 seems a little inadaquite for 32s. Do you drive at a lot of highway speeds? You could try turning your overdrive off if you motor is lugging.
i would say half highway speeds and half city speeds ... i dont know how to turn off overdrive theres no button
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 10:55 PM   #26
The Jeep Life.

WF Supporting Member
 
Cdwright's Avatar
 
Join Date: Mar 2013
Posts: 878
Quote:
Originally Posted by JDsDream View Post

This is why many people have their speedos recalibrated when they increase the tire size.
I think there might be a legal requirement for you to do this anyway.
Cdwright is offline   Quote Quick Reply
Old 08-04-2013, 11:05 PM   #27
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by JDsDream View Post
I'm not a JK owner but I will give you some basics that apply to all Jeeps. First they are rolling bricks. The aerodynamics...well there are none.

Your mileage can have many variables. You are new to this and if like me, when I first got my Jeep, I tried to drive it the way I drove my car. Once you settle in and you adjust your driving style, you will see an increase in mileage.

As mentioned above, when you increase the tire size, it throws everything else off as far as mileage is concerned. Your computer registers rotation of the tires at their stock size. Obviously a larger tire is going to travel a farther distance per rotation. It isn't much, but it makes a difference. This is why many people have their speedos recalibrated when they increase the tire size.

If you have a GPS that shows mileage, you can use that to compare the varience in what your odometer reads.

Top configurations, (topless, hardtop, soft top) and load will also have an effect.

I would suggest that you keep tabs of your mileage by setting your tripometer to 0 when you fill up and dividing that number by the number of gallons required to refill. This will at least give you a more accurate idea of how far you can go on a full tank.

Give it some time and I think that you will see a change for the better.
thats what i did and im getting around 12-13 mpg combined and i drive calm ..
i hope the mpg get better
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 11:09 PM   #28
Jeeper
 
RuffMuttK9z's Avatar
 
Join Date: Jun 2013
Posts: 122
I am currently running 32" Mud Terrains with 3.73 gears on my 2012 JKU and getting close to 19mpg. As others have mentioned, you'd probably benefit from calibrating your speedometer, and I bet you'd also get some improvement with a re-gear. 3.21 seems pretty low for 32" tires. Even at 3.73 mine can get sluggish pretty quickly on hills.
RuffMuttK9z is offline   Quote Quick Reply
Old 08-04-2013, 11:12 PM   #29
Jeeper
 
redrockculichi's Avatar
 
Join Date: Jul 2013
Posts: 55
Quote:
Originally Posted by RuffMuttK9z View Post
I am currently running 32" Mud Terrains with 3.73 gears on my 2012 JKU and getting close to 19mpg. As others have mentioned, you'd probably benefit from calibrating your speedometer, and I bet you'd also get some improvement with a re-gear. 3.21 seems pretty low for 32" tires. Even at 3.73 mine can get sluggish pretty quickly on hills.
by calibrating my speedometer is going to give me better mpg's?
redrockculichi is offline   Quote Quick Reply
Old 08-04-2013, 11:21 PM   #30
Jeeper
 
RuffMuttK9z's Avatar
 
Join Date: Jun 2013
Posts: 122

RuffMuttK9z is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 01:48 AM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC