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Old December 5th, 2012, 03:09 PM   #1
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Default JK rubi fuel economy question

Just picked up an 013 rubi unlimited for my wife it has 3" lift and 35" Trepadors auto trans with 4.10 axles, it is averaging about 12mpg. Anyone else with a similar set up seeing these numbers?
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Old December 5th, 2012, 03:57 PM   #2
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My wife's 2012 gets about 18 stock so I would think that's about right with the 35's. 4.10 gears are not that low, especially in a jk. The weight and width of a tire that large will kill you every time.
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Old December 5th, 2012, 05:13 PM   #3
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3rd tank with me driving gordon lightfoot has seen a slight increase according to the lie o meter. I'll calculate again next fill up based on distance to gallons. The killer was that it was almost all highway miles to Chicago and back.
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Old December 5th, 2012, 05:37 PM   #4
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Ditch the tires for something more tame. Duratrac/toyo at2/bfg at
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Old December 5th, 2012, 05:40 PM   #5
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HEMI , 5.13s, D60 , dual winch, hard top, AEV front and Expedition rear steel bumpers. I average 11.7 and if I do all highway I can squeak out 12.1 MPG.
I'd say you are spot on for tires and lift. The engineers say 4.10s are good for 35s.
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Old December 5th, 2012, 05:40 PM   #6
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Wont your mpg gauge be off with bigger tire size anyways? plus the extra load of the tires?
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Old December 7th, 2012, 03:53 PM   #7
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latest economy is about 11.9 ave. the treps are probably going for some 33s. They by far are the quietest tire I've driven with an aggressive tread. I'll swap stocks back on for a while to see what the mileage will be. I have checked other Jeep forums and people seem to pull much better then mine. I have heard the first sign of a bad pentastar is horrible mileage.
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Old December 7th, 2012, 04:01 PM   #8
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As far as the gauge the dealer did all of the install and recalibrated it back to spec and according to gps it seems to be right on. Cuz I didn't want to get all greasy and junk you know doing my own lift. Plus I loaned out my crescent wrench and pliers and my mom hasn't returned them.
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Old December 7th, 2012, 04:16 PM   #9
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My 09 jk 4 door with 33s MTs , cold air intake, jet chip ect gets about 13 to 15 with a combo of stop and go. Drives me crazy.
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Old December 7th, 2012, 04:29 PM   #10
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man you make me want to keep my H2. its getting 12.4 mpg :)
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Old December 8th, 2012, 07:56 AM   #11
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Newsflash, after some around town driving with fuel economy in mind, my wife reported that mileage has dipped firmly into the single digits at 7.9 mpg. How low can you go? I am thinking about letting her drive my dually with a healthy big block pushing close to 500hp. It gets 9mpg and is a hoot to drive. Not a 4 door though. Today the stock tires go back on fo sho.
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Old December 8th, 2012, 08:35 AM   #12
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Wifes 08 JK with 3.5 Lift 35" Mt's Cold air,Cat back, Diablo Tuner with 5.13 Gears. 18 on the High way 14-15 in the city. Avg 16 with both. The Key with the JKs is to rear gear them!!!! The gears were the the last thing we did and saw the biggest inprovement.
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Old December 8th, 2012, 10:24 AM   #13
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It seems like the stock tires will bring back most of the economy but I can't see it going from single digits to mid teens. My suspicion is something is amiss in the engine. What gear would be best with 33" tires. 32s are stock if I go up 1 inch that is an increase of about 3 percent. A 3 percent increase in gear ratio would be 4.22. Seems to me that 4.56 ratio would be overkill for a tire increase that small, unless they are severely undergeared from the factory. But a 4.56 gear would seem proper for the 35s.
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Old December 8th, 2012, 12:12 PM   #14
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I average 13-14 MPG around town with 37's and 5.38 gearing in my 07 Rubicon, automatic 4 door. My buddy John has a new 2012 4 door and I think he is getting around 18-19MPG. Here is a link to his build

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Old December 8th, 2012, 02:17 PM   #15
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I can get 21 mpg going down the highway but its the stop and go that really kills it. And the constant shifting of the automatic is insane.
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Old December 8th, 2012, 02:43 PM   #16
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On a trip to Chicago 11ish was the best she could do according to the computer but the 4 refuel stops for a 560mi trip confirms that economy is bad! Butler, your buddy Johns is very similar to mine, color and all, except mine is the auto and the rubicon so I would think we should see similar mileage numbers with the 4.10 gears and all. I'm not expecting 20 but 8 is not what I expected at all. I'm hoping for a check engine light to come on and let the dealer figure it out now that I'm married to this thing. Also in my driving it with the 3.6 and 5spd auto it doesn't seem to have trouble figuring what gear to be in.
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Old December 8th, 2012, 02:46 PM   #17
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Thanks to everyone who has responded, all the input is great and I appreciate it.
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Old December 8th, 2012, 02:57 PM   #18
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I"ve had my Moab since monday. Its about 18 on the highway, and the rest of the week its averaging 16.5 mpg Stock tires, 2 door 6 speed. Alomst 700 miles in less than a week.

A guy at work has a JKRU auto on 35's and he's getting about 14.5 mainly stop and go.
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Old December 8th, 2012, 04:39 PM   #19
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the new engine/trans combo is alot better. You dont have to gear as deep.

if you ran 33" I would NOT regear. are you 3:73 or 3:2x? now?

get a programer for about 300. My guess is the dealer only did a procall to correct the spedo?
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Old December 8th, 2012, 06:22 PM   #20
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Pretty much sums it up, all JEEPS suck when it comes to mpg
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