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Old 02-14-2014, 07:04 AM   #1
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Another MPG Thread

Ok well this is what I got. I have a 2005 Unlimited auto w/hard top, 3" tube style front and rear bumpers, rocker guards, rear corner guards, 15" aftermarket alloy wheels wrapped in 31x10.5 Mastercraft AT's with factory suspension and 66K on the clock. I just got this jeep and prior to getting it I read in several forums that wranglers will get around 16-18 MPG on the HWY. Now I will say that im not trying to get 20 MPG out of this wrangler I am aware that I basically bought an anti Prius. Currently im only getting around 14MPG. My driving is about 70/30 Hwy/City all flat ground. In town I try not to let it shift over 2K. On the HWY I set the CC on 60 and let it ride and accel. to 60 it shifts around 2500-2750. Is 14 MPG normal for these conditions? I have read that sometimes the O2 sensors will go bad and the computer not set a CEL and they will get poor MPG do yall think this is the case? Is there a way to check the o2 sensors? I know people will post that I can get better MPG by buying a car or walking/riding a bike. All I want to know is my MPG normal if not could a have a sensor or something going bad. Thanks.

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Old 02-14-2014, 07:18 AM   #2
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How far off is your speedo? That obviously will impact the math unless your not using the jeeps odometer to calculate. Also ethanol is less efficient than gasoline so that decreases it too depending on the blend your station uses. It might not be all the jeeps fault.....not really answering your question. I guess for about $100 you could change them all out.

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Old 02-14-2014, 07:35 AM   #3
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Yea Im trying not to spend the money if its not needed. I think my speedo has been corrected I used a GPS speed app on my phone and they matched at all speeds. Also the gas station I use advertises no ethenol. I use the jeeps trip meter to calculate how far I've gone and divide it by how much gas I put back in. I always fill up and I try to use the same pump.
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Old 02-14-2014, 08:14 AM   #4
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I saw 14-15 mpg at best with mixed (mostly 40mph in town) in my '99 TJ soft top on 31's. I saw 11.8 at best mixed (mostly freeway) in my '06 hardtop LJ on 265-75-16's with 16x8 aluminum wheels. I just changed to 31's on 15x8 so I'll see if it changes. I will say that turning the OD off until I'm steady over 2k rpm with it on helps a little. I'm still investigating on mine, and I don't drive like a grandma so that doesn't help. I also expected a few more mpg than I'm seeing.
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Old 02-15-2014, 01:25 AM   #5
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Yeah my best so far was about 15.5. I am testing to see if a higher gas grade will get more mpgs. I know every vehicle is different but in my old blazer I found that switching from regular to mid grade got me over an extra 2 mpgs on average.
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Old 02-15-2014, 06:08 AM   #6
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If the cost analysis of higher octane in a wrangler panned out I'd be surprised. It's winter blend time which can usually be blamed for a mpg or two, perhaps that and some o2 sensors on their way out is all it is. My o2 sensors and a speedo calibration is all that's left for me to look into. Good luck!
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Old 02-15-2014, 07:02 AM   #7
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Your gonna be had pressed to get much better mileage than you are clocking now. Just keep the plugs changed and the oil and fluids changed. A new 02 sensor never hurts what $15 bucks for the sensor,clean your air filter every 3-4K. Other than engineering a hydrogen generator in your Jeep your kinda stuck between 10mpg and 16...J~ust E~xpect E~mpty P~ockets..JEEP
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Old 02-15-2014, 07:09 AM   #8
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A new 02 sensor never hurts what $15 bucks for the sensor...
Actually, it's more like $25x4, but I agree it's not stupid expensive NTK is the only brand I'd run in my Jeep. To each their own though.

Cheapest I've found:

http://www.rockauto.com/catalog/x,ca...,parttype,5132
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Old 02-15-2014, 07:23 AM   #9
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I've heard that's it only the 2 upstream o2 sensors that the computer reads to adjust the air/fuel ratio, and the rears are there to let the computer know if the cats are bad. Does anyone know if this is correct?
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Old 02-15-2014, 07:24 AM   #10
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Slightly different info...and I am no "expert" only my experience. Running anything other than the 87 octane the TJ was designed for is asking for trouble. My TJ developed a "taste" for catalytic converters when I did that.
Adding "fancy" spark plugs will not help. TJs IMO are kinda like a lawn mower, not a lot of "hop up"/ "performance parts" to add to it.
My TJ when new back in '04 got its best mileage "bone stock" of 23 mpg on the highway on ONE TRIP! But would frequently give me 18-20 mpg on the highway even when it was a year or so older. The upgrade to 31"s actually made my speedometer "correct", I can only assume the "stock" tires were slightly "off" which would have given me "better" mpgs......(whole 'nother thread in that).

I did not have the extra weight of the longer wheel base and I also have a 5spd, which may or may not help mpgs.

FWIW as it sits now with 33" tires, steel wheels, winch, after market bumpers, different Soft top, SYE, and other assorted accs......I get about 15-17 around town...and I drive like the Grandpa I am. It doesn't see much highway use any more, I have other Jeeps for that, but it is my DD to work and for wheeling.

If you want "better" mpgs put it back to stock, but we don't like them that way. I do know that there was a switch to the coil rail for the ignition which eliminates the wires and distributor, not sure if that could also factor into the equation.

I do change my plugs every year. And my air filter is not "stock" (whole 'nother can of worms there). I also run full synthetic as I feel it makes my motor work less.

I priced 02s for my TJ (mine has 4) some only have 3, and the total for the same as OEM was close $200 they are more costly than ya would think.
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Old 02-15-2014, 07:52 AM   #11
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I priced 02s for my TJ (mine has 4) some only have 3, and the total for the same as OEM was close $200 they are more costly than ya would think.
Check the link I posted. The NTK are the OEM, $25 each. For my '99 I paid $72 shipped.
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Old 02-15-2014, 08:22 AM   #12
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I pulled my O2 sensors and cleaned them when I first bought my TJ.They were filthy. Covered in crud. It ran a lot better after that. Check your tire pressure. Make sure it's right on the money. Most here will say 28-30 PSI depending. New air filter (not CAI or oil type just plain jane WIX etc), OEM spark plugs, good wires will help also. I try to run non-ethanol fuel only in my 97 4.0 but the occasional tank of 87 octane Ethanol does find it's way in. It runs like shit on ethanol. Once in a blue I run a bottle of fuel system cleaner through it and that will clean up whatever mess the ethanol left behind (mainly rough idle). The best I've used is called HY-PER fuel. My Jeep runs so good on this stuff. I was a loyal SeaFoam customer for years and I still run it through the wife's 96 Infinity twice a year. However someone suggested this Hyperfuel and I cannot recommend it enough.

Total Fuel System Cleaner
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Old 02-15-2014, 08:41 AM   #13
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Check the link I posted. The NTK are the OEM, $25 each. For my '99 I paid $72 shipped.
Old man lazy and bad eyes......I have trouble reading and figuring out what I need on that site...just sayin' the quote I got was walking into an Advance auto......
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Old 02-15-2014, 08:55 AM   #14
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Old man lazy and bad eyes......I have trouble reading and figuring out what I need on that site...just sayin' the quote I got was walking into an Advance auto......
Fair enough. Worth the savings though!
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Old 02-15-2014, 08:57 AM   #15
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Fair enough. Worth the savings though!
True...I also prefer seeing a person and dealing face to face...I realize that is not always possible but I try to help the local market when possible. Have heard good things about Rockauto....
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Old 02-15-2014, 09:06 AM   #16
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2003 Rubicon 4.0L automatic. I just gassed up yesterday afternoon and turned just over 14mpg. Now most of that was used driving in 4H due to the road conditions after the snow here in Virginia and my speed was pretty low for at least 150 miles out of that tank. I've had a little better and have around 104k on it. I'd say that based on your specs 14 isn't horrible but I'm sure you can squeeze out at least 1 more MPG with some basic tune up items.

Plugs, Air Filter, Tire Pressure, etc. The low hanging fruit is usually the cheapest way to gain at least a little MPG.
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Old 02-15-2014, 10:01 AM   #17
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I pulled my O2 sensors and cleaned them when I first bought my TJ.They were filthy. Covered in crud. It ran a lot better after that. Check your tire pressure. Make sure it's right on the money. Most here will say 28-30 PSI depending. New air filter (not CAI or oil type just plain jane WIX etc), OEM spark plugs, good wires will help also. I try to run non-ethanol fuel only in my 97 4.0 but the occasional tank of 87 octane Ethanol does find it's way in. It runs like shit on ethanol. Once in a blue I run a bottle of fuel system cleaner through it and that will clean up whatever mess the ethanol left behind (mainly rough idle). The best I've used is called HY-PER fuel. My Jeep runs so good on this stuff. I was a loyal SeaFoam customer for years and I still run it through the wife's 96 Infinity twice a year. However someone suggested this Hyperfuel and I cannot recommend it enough. Total Fuel System Cleaner
What did you clean them with? Soak them?
Does anybody add Stabilizer to their gas? I use it in all my lawn equipment to help protect it from ethanol. Hadn't thought about the jeep till now.
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Old 02-15-2014, 10:09 AM   #18
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Wish I could get 14 my 98 4.0 with an auto gets around 9-10. 4"suspension 1.25" body 35" tires aftermarket rear bumper rock sliders and a winch.
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Old 02-15-2014, 10:26 AM   #19
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Wish I could get 14 my 98 4.0 with an auto gets around 9-10. 4"suspension 1.25" body 35" tires aftermarket rear bumper rock sliders and a winch.
Have you "re-geared"? My mpgs actually went back up some after I regeared for the added tire size...can't regear for the weight though.....
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Old 02-15-2014, 10:30 AM   #20
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If you have an IPhone, there is a great app (free) that will keep up with all of your gas mileage calcs, and maintenance. Its called Gas Cubby, and is sponsored by FRAM. I've been using it for years on all my cars. It even gets detailed enough that you can find out all kinds of details ($/mile, max MPG, Min MPG, and many other things).

BTW, my stock 2013 JK Sahara is getting 16.5 MPG avg, 19.2 max MPG, and 14.6 MPG min @ 12,000 miles.
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Old 02-15-2014, 10:33 AM   #21
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Have you "re-geared"? My mpgs actually went back up some after I regeared for the added tire size...can't regear for the weight though.....
Yep it's got 4.10 gears
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Old 02-15-2014, 10:38 AM   #22
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Yep it's got 4.10 gears
There's your mpg problem.
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Old 02-15-2014, 10:53 AM   #23
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There's your mpg problem.
Not really everyone says 4.56 but mine with 4.10 turns like 2900 rpm at 65 that's a little high as it is. I can't imagine what 4.56 would turn on the highway.
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Old 02-15-2014, 11:02 AM   #24
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Not really everyone says 4.56 but mine with 4.10 turns like 2900 rpm at 65 that's a little high as it is. I can't imagine what 4.56 would turn on the highway.
That sounds closer to 34" for a 32rh based on my math, but perhaps I'm off. I would suspect it's the time you spend in the other (lower) speed ranges that are eating excess gas but again, it's not my rig so maybe I'm wrong. I get crappy mileage and it's probably the way I drive, which isn't likely to change a bit.
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Old 02-15-2014, 11:28 AM   #25
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That sounds closer to 34" for a 32rh based on my math, but perhaps I'm off. I would suspect it's the time you spend in the other (lower) speed ranges that are eating excess gas but again, it's not my rig so maybe I'm wrong. I get crappy mileage and it's probably the way I drive, which isn't likely to change a bit.
Idk they are 35 12.59 15 Goodyear mtr/Kevlar. And I drive crappy as well so I'm sure that contributes but I think I have other problems because my father in law has an almost identical jeep to me tires and all but gets about 14 but his is a 00 so it has the coil pack idk how much that affects things but that is the only real difference besides brands of parts we even have the same tires.
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Old 02-19-2014, 11:04 PM   #26
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Well I took my Jeep to the dealership and had them test the o2 sensors and check over all the sensors to see if they could find anything wrong on the computer side. According to the shop all the sensors test good. The mechanic set the Cam and Crank synchronizer from 8 degrees to 1 degrees saying that should help a little but IDK. He also noted that the engine temp was 210 at idle and that my antifreeze was pure and needed to be diluted. But the main concern that I have is that he noted that the Manifold VAC was at 17 and that was a little low and I may have a leak and wanted to perform a leak down test to check. Does that seem low to anyone? They want to charge 80 for the test and that the leak may cause poor MPG's. Does anyone know if this seems legit?
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Old 02-19-2014, 11:57 PM   #27
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Sounds like bs reason no answers is people never heard of it. I hate thieves.
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Old 02-20-2014, 10:13 AM   #28
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Really 14-17mpg’s in ya’lls jeeps…..Dang I get like maybe 11mpg on a good day, going downhill, with the wind blown 50mph’s behind me, with the spinnaker sail out, and a football team pushing me!

I tried the Prius thing offroading but the trail selection I was limited too wasn’t fulfilling enough.



So a buddy let me borrow his lift and his welder and we optioned out the Prius one afternoon and Viola!



Dang… now I’m back to 11mpg again.

Next week, I'll start over with the SmartCar.....

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Old 02-20-2014, 10:34 AM   #29
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Hummm. Well I think the smart car looks better but the wheel base is too short and may roll to easy on a steep incline so I guess Prius it is plus I can seat 5. Interesting ideas you have given me.
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Old 02-20-2014, 10:52 AM   #30
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Punch out your catalytic converters , gain a little more power and better mileage . Or get some high flow converters if your state requires emission testing.

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