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Old 09-26-2011, 12:34 PM   #1
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Horrible mileage..Programmer help?

2012 jku,auto,3:73 rear end. 33" Duratrac tires and mamba alloy wheels. Getting 13.2 mpg in almost all city driving by the computer and my own math. Previous owner of 5 Jeeps so i know mileage isnt the best but..only has 500 miles so its not totally broken in yet but for reference a friend has 2012 sport with the same tires/wheels, but a 3:21 rear and its a manual and getting 16.7. I have been pretty light on the pedal as well. Is this something the dealer can check for-like a bad o2 sensor or something? Seems to be running fine. Any thoughts would be appreciated.

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Old 09-26-2011, 12:39 PM   #2
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Your friend drives more on the highway?

Sorry, but those numbers don't sound that bad for "all city" driving on 33s. Sitting at stop lights, stop-and-go, lots of accelerating only to brake moments later to slow down and perhaps stop, then start again, idling in traffic jams, etc.

I would've guessed somewhere between 13 and 15.

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Old 09-26-2011, 12:40 PM   #3
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Sounds like something isn't right. What kind of fuel do you use? What is its ethanol content?

We've been averaging just under 18 with the same tires and axle gear you've got, but it's a manual 2 door. Those two things shouldn't be worth 5 mpg though. There are others with considerably better numbers than mine even in a 4 door.
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Old 09-26-2011, 12:46 PM   #4
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Of course I don't have a 2012 but I was getting 17 in city before new bumper and 33", then it shot down to 13.5. Superchips got me back to a little over 15 but still, once you go bigger it isn't the same anymore. The stock tires/wheels are light weight to help with gas mileage. As soon as you pull them off for a better tires/wheels, the mileage goes with it. I hope the tuner market catches up soon for the newer equipment.

I think someone pulled the wool over the consumers eyes about the new motor getting better gas mileage. Don't seem any different to me.
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Old 09-26-2011, 12:49 PM   #5
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The gas is 87 octane from local mobil station, not sure of the ethanol content. What pressure do you run your duratracs at? did you recalibrate your speedometer?
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Old 09-26-2011, 12:56 PM   #6
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Quote:
Originally Posted by chcg12 View Post
The gas is 87 octane from local mobil station, not sure of the ethanol content. What pressure do you run your duratracs at? did you recalibrate your speedometer?
I don't remember what the pressure was at. I did reluctantly plug in a Procal and recalibrate my speedometer. Based on the change it made in rpm vs speed I would say the speedometer wasn't very accurate to start with. I'm pretty sure it was indicating faster than I was actually driving before, but I didn't verify that. The change from stock tires to 33's will change the mileage you calculate by 7 or 8% just because of the difference in tire height. Even when you get that back by having an odometer that reads correctly you will still be a little low. Having the shift points back where they belong may help a little more.
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Old 09-26-2011, 01:04 PM   #7
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Oh great....I was going to buy a 2012 for my Daily Vehicle...and get some 33' wheels.....that gas milage sucks. I'm better off buying a used 2007 and making it a weekend vehicle.
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Old 09-26-2011, 03:18 PM   #8
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I have an 07 2-door on 35's and average low 13's with mainly city driving, granted she is wearing BFG MT's and I figure that has a little to do. I drove it on a 2 hour round trip highway trip last weekend and it only came up to low 15 MPH. It's a Jeep, not a Prius.
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Old 09-26-2011, 03:46 PM   #9
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Seems a little low...but nothing crazy.

I guess a +4000 pound brick on 33 inch wheels simply isn't a very good "city only" vehicle.

Let the engine break in...and get your speedo adjusted....

Stop and go driving is just brutal on the fuel economy for heavy vehicles. (Maybe a diesel would help)
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Old 09-26-2011, 04:13 PM   #10
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What size are your mamba wheels? Assuming they are 17" or 18" and your running 33" duratracs...those are heavy tires. On the flip side, I'm running 33" duratracs on 15" wheels with 3.21 gears with my 6-speed and getting 17.5 in the city.

There is a BIG weight difference between tires on 15" vs 16" vs 17" vs 18" etc...
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Old 09-26-2011, 04:28 PM   #11
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I have an 07 JK 4 door with 35x12.50x18 and a 4" lift and I get 13 - 14.9 MPG both HWY and CITY. Now I do have a superchip programmer on it but I don't think that helped out to much, maybe 1 - 2 <PG
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Old 09-26-2011, 04:46 PM   #12
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I have the same set up as you except I'm on ProComp 7069's. I'm averaging 15.6 after 530 miles. Mostly rural driving with about 15% city. I'm sure if I did all city it'll be around your average. Stock I was getting 17.6, but that was the first 100 miles.
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Old 09-26-2011, 05:25 PM   #13
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Quote:
Originally Posted by Bullfuel View Post
I have an 07 JK 4 door with 35x12.50x18 and a 4" lift and I get 13 - 14.9 MPG both HWY and CITY. Now I do have a superchip programmer on it but I don't think that helped out to much, maybe 1 - 2 <PG
This is good to know i have the same set up and only getting a little over 10mpg. I will be planning on getting a superchip. Thank You

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