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Old 08-04-2013, 05:01 PM   #1
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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
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Old 08-04-2013, 05:06 PM   #2
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That seems low to me, a lot depends on how you drive and driving conditions. I easly get 17mpg mixed driving.

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Old 08-04-2013, 05:09 PM   #3
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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
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Old 08-04-2013, 05:15 PM   #4
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lol, MPG in a lifted Jeep

I love these threads
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Old 08-04-2013, 05:16 PM   #5
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lol, MPG in a lifted Jeep

I love these threads
mine is not lifted ??
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Old 08-04-2013, 05:25 PM   #6
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Do you have 4.10s?
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Old 08-04-2013, 05:26 PM   #7
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Do you have 4.10s?
What is 4.10s ? im new to jeeps everything is bone stock except wheels
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Old 08-04-2013, 06:13 PM   #8
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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?
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Old 08-04-2013, 07:36 PM   #9
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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 ✌
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Old 08-04-2013, 07:48 PM   #10
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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.
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Old 08-04-2013, 07:55 PM   #11
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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
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Old 08-04-2013, 08:04 PM   #12
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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.
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Old 08-04-2013, 08:10 PM   #13
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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
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Old 08-04-2013, 08:12 PM   #14
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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 .
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Old 08-04-2013, 08:22 PM   #15
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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
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Old 08-04-2013, 08:29 PM   #16
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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.
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Old 08-04-2013, 08:41 PM   #17
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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.
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Old 08-04-2013, 08:56 PM   #18
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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.
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Old 08-04-2013, 09:03 PM   #19
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..
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.
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Old 08-04-2013, 10:05 PM   #20
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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
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Old 08-04-2013, 10:05 PM   #21
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What tire size, what axle ratio (look at your axle for a tag), what transmission and finally any engine codes?
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Old 08-04-2013, 10:13 PM   #22
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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
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Old 08-04-2013, 10:22 PM   #23
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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.
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Old 08-04-2013, 10:31 PM   #24
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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.
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Old 08-04-2013, 10:42 PM   #25
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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
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Old 08-04-2013, 10:55 PM   #26
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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.
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Old 08-04-2013, 11:05 PM   #27
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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
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Old 08-04-2013, 11:09 PM   #28
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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.
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Old 08-04-2013, 11:12 PM   #29
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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?
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Old 08-04-2013, 11:21 PM   #30
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