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Unread 02-24-2013, 07:43 AM   #1
cpca3
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Poor Mileage 2013 JK Wrangler Sahara

I bought my first JK about 2 months ago. It's a 2013 Sahara Unlimited with a dealer installed 2" lift and 33" tires. I drive it mostly on the highway in cold Alberta, Canada. My problem is the gas milage - at best it's getting about 350 km (218 miles) per tank. With a 22.5 gallon tank that works out to less than 10 miles per gallon. The on-board fuel economy display is showing a similar result - averaging about 23 l per 100KM (or about 10 miles per gallon). I took it into the dealer to get them to look it over and run a bunch of tests that did not reveal any obvious mechanical problems. (or so they say). The dealer said they could not do anything and poor milage is normal during the "break-in" period and that the lift and larger tires are also part of the problem. The Jeep has about 1,200 miles on it right now.

Everything I've read on this forum tells me I should be getting 15-20 mpg. At 70-75 Canadian dollars per tank, the jeep is quickly loosing it's appeal to me. My questions to the group:

a) is there anyone else out there with similar problems?
b) any ideas what could be wrong with it mechanically?
c) what should I do?

Thanks in advance!!
CP

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Unread 02-24-2013, 10:50 AM   #2
RockyClymer
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Did they re-set the ECM to reflect the larger tires? If not, then you are reading low...my guess it should be around 15mpg...
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Unread 03-01-2013, 10:34 PM   #3
aldaman
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For starters, get an AEV Procal to adjust your tire size, that in turn will calibrate your speedo/odometer to give you a true reading of your gas mileage unless you are doing a hand calculation and the result you posted is accurate. But you have to consider that you changed the dynamics of the jeep with the lift and bigger/heavier tires. Now there is more drag with the lift and rolling resistance with the tires. For me I have a 2.5" RK lift with 33" Boggers, I am averaging between 13-14mpg with that set-up. To me, that is my trade off for doing those mods and enjoying my Jeep for what it is....I have also heard about the Diablo sport intune programmer that supposably gives better gas mileage....

When my jeep was stock with the 4.10 gearing, I was averaging 14-15mpg city driving, so the drop in mpg is acceptable to me....
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Unread 03-01-2013, 10:59 PM   #4
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I run 37s on 2" of lift and 4.11s on the 6 speed and I can easily grasp 17mpg on the interstate with my cruise control set to 70mph

Either your speedometer is wrong, (and it is) or there is something wrong with your jeep

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Unread 03-02-2013, 06:24 AM   #5
teamgreen666
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Yeah get yourself the procal. I'm in a 2013 JKU on 35's and I'm getting 15-16 mpg city and 18-20 mpg highway.
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Unread 03-02-2013, 07:10 AM   #6
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How fast are you driving? Anything above 70 mph makes a huge difference because of the way aerodynamics work. The slower you drive the better your mileage. Acceleration is also the mortal enemy of economy--you can make a big difference by accelerating very slowly. Try using the "Eco" feature. It's surprisingly difficult but if you have the disciplined to do it you'll be surprised. Use your cruise control as much as possible, even on surface streets. If you have to slow more than five mph on the highway, don't hit "resume" which causes you to accelerate sharply. Instead hit "set" and slowly step back up to speed over a few miles. There's a lot of little things you can do to increase mpg--do some research. Jeeps will get decent mileage if you're willing to do what it takes.
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Unread 03-02-2013, 07:38 AM   #7
pentastarguy
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i agree with others, dealer didn't reset computer for the larger tires.speedo is registering less miles, so even your hand calc will be off.
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Unread 03-02-2013, 07:59 AM   #8
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Totally agree with all the above. When the gauge says the tank is empty there could still be 5-10 Litres still in there. Assuming the tank is empty then calculating by tank capacity will give you false numbers as will calculating using klm from an incorrect speedo.
First check speedo calibration then hand calculate your mileage as follows:
- Fill your tank to full.
- Set trip meter to 0
- go about your week driving as you usually do
- once you get to around 350klm fill tank
- record actual liters required to fill tank
- use the actual klm recorded on trip meter and actual liters used to calculate mileage.
- there is an app that can do this for you.
- repeat this over the course of 3-4 tanks of fuel and average.

Jeeps are known to be hard on fuel especially in the winter, but you can make a difference in how you drive.
I can get 18mpg (13L/100klm) by being mindfull of how I drive. This is with 08 unlimited 3.8l on 35" Pitbull tires, 2.5" lift, A/T, 3.73 factory gears running overdrive OFF ( equivalent of 5.13 gears). Speed is also a factor due to poor aerodynamics. Generally 50-60 mph (80-100kph) will yield the best mileage.
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Unread 03-02-2013, 08:24 AM   #9
Emoto
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Won't the odometer be off just the like speedo, if the tire size is not correctly set?
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Unread 03-02-2013, 08:31 AM   #10
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If you have an auto it's not shifting optimally if the tire size has not been set correctly.
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Unread 03-02-2013, 08:39 AM   #11
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Quote:
Originally Posted by Emoto
Won't the odometer be off just the like speedo, if the tire size is not correctly set?
Yes it will .. They are one in the same.

Auto shiftpoints will be a little out but not enough to really matter. Factory tires are 32" so going to a 33 isn't that much difference.

It's more about getting the proper/accurate numbers to do the calculation so you know where you are at.

I am going to assume that the OP's Jeep also has factory 3.21 gears so stepping up to bigger tires is certainly going negatively affect mileage and drive ability.
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Unread 03-03-2013, 07:44 AM   #12
farmer-dave1
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I'm curious as to what gearing is in your jeep, also what tires you running are they e rated. Just another option to try is sell the lift with tires, swap out to stock with another owner and take that money and throw for a winch or new bumper. Perhaps your mileage will improve with more break in.
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Unread 03-03-2013, 02:57 PM   #13
taoshum
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Go out some time and drive between two fuel stations that are a known distance between them, like 30 miles or so. Fill up at the first one, drive to the second one, fill up again. Now you know you just drove 30 miles, independent from the odometer and you know just how much fuel it took. If you are really getting 10mpg, you'll need 3 gallons. Then compare to the odometer, the mgp readout and see if it is reading accurately. If not, re calibrate with pro-cal or the dealer so these numbers agree. BTW, you can time yourself using a watch between mile-markers while you hold 60mph, if your speedo is accurate, it will take 60 seconds to go one mile at 60mph. If it takes a few seconds less, you were going faster than 60mph, roughly one mph for each second less than 60 sec. If it takes a few seconds more, then the you were going slower than 60 mph.

Good luck, gas is not cheap anymore, except in Venezuela... Seems like you could get 15-18...unless you are running really hard.
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Unread 03-03-2013, 03:27 PM   #14
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Just a thought, If you have remote start, sitting and idling while it warms up kills gas mileage.
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[SIZE="1"][B]97 TJ:[/B] daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
[B]98 TJ:[/B] Daugher 2 - 4.0L, 5spd, D44 rear
[B]06 LJ Rubicon:[/B] mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
[B]13 JKU Rubicon:[/B] Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs[/SIZE]
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Unread 03-04-2013, 12:42 AM   #15
SubAtomicGenius
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Really cold weather? Icy/snowy roads? A little too heavy on the skinny pedal? Driving over 100 clicks per hour?

In reality going from stock 32's to 33's isn't much of a bump for the speedo - that's what, about a 3% difference? Sure it will add up, but methinks that the first points I mentioned might be the reason.

Try sticking to the speed limit for a tank, take it easy on the acceleration, and note if you encounter a lack of traction/slippage during acceleration. I know I get ****ty mileage during the winter and my driving habits affect the overall results dramatically. Plus if you're doing a lot of highway driving and you go over 110-120 clicks, your mileage will go to ****.

If that fails, then I'd say that there is something wrong.
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