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Old 09-03-2011, 04:43 PM   #61
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Picked up my 2012 2dr Rubicon auto w/4.10s last week in Williamsport Pa. Drove home to Cleveland, Ohio with my 33" Duratracs on it. 80mph most of the way at 3000rpms netted 16.9mpg! For comparison, I drove my 2011 Sport 2dr with auto, 3.73s and 33" Duratracs out there to trade it in. 80mph most of the way (was'nt easy) at 2100 rpms netted 15.2 mpg!

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Old 09-03-2011, 04:48 PM   #62
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Picked up my 2012 2dr Rubicon auto w/4.10s last week in Williamsport Pa. Drove home to Cleveland, Ohio with my 33" Duratracs on it. 80mph most of the way at 3000rpms netted 16.9mpg! For comparison, I drove my 2011 Sport 2dr with auto, 3.73s and 33" Duratracs out there to trade it in. 80mph most of the way (was'nt easy) at 2100 rpms netted 15.2 mpg!
Very good info, thanks!

Did you notice any particular speed at which the MPG really took a hit?

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Old 09-03-2011, 05:34 PM   #63
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Very good info, thanks!

Did you notice any particular speed at which the MPG really took a hit?
Not really, but the power difference really was substantial.
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Old 09-03-2011, 06:54 PM   #64
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384 miles, second fill-up, 15.7 mpg.

4.10s and lots of skinny pedal.
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Old 09-03-2011, 11:43 PM   #65
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177 miles all at 70 mph resulted in 16.8 mpg. The following are the specs:

'12 Rubicon Unlimited
Auto
4.10
Soft top up
A/C on
Me, wife, and three small children
Cargo area full with luggage and presents
87 octane added with 10% of our food supply (ethanol)

I540 South from Fayetteville, AR down to I40 East to Conway, AR
I have the same set-up but w/hard top... It appears 70 mph is the sweet spot for mpg efficiency... It's right at the end of green where the white little mark on the RPM gauge is. I have been averaging 16.9 mpg city/highway combo with highway overpasses every mile or so...
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Old 09-04-2011, 01:27 AM   #66
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4th fill-up at 762 miles on odometer.

16.76 MPG calculated, 17.4 on EVIC.

All town and country. No highway - all below 50 MPH, including the usual mileage killing hill I live on.

On after about 5 miles of 45 MPH flat stretch, the just reset at fill-up EVIC read 23+ MPG, before I hit 'the hill.'
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Old 09-07-2011, 02:22 PM   #67
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I gota respectable 17.8 MPG on a trip to OCMD with a bit of stop and go labor day traffic and a cruising speed at around 75 MPH
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Old 09-07-2011, 02:30 PM   #68
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I have the same set-up but w/hard top... It appears 70 mph is the sweet spot for mpg efficiency... It's right at the end of green where the white little mark on the RPM gauge is. I have been averaging 16.9 mpg city/highway combo with highway overpasses every mile or so...
Ahhh...I've been looking for that kinda info.

If you are running 4.10's on a 2012 auto...are you running at 2500 RPMs?
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Old 09-07-2011, 02:43 PM   #69
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I was really hoping the '12 would provide much better fuel mileage with the new motor but man these things don't appear to be getting anywhere near their advertised highway mpg ratings from what I'm seeing in this thread. I would like to average 20mpg on my daily commute to justify one. What options should I steer clear from to maximize fuel mileage? And please no comments from anyone about how 'you shouldn't buy a wrangler if you want fuel mileage' because that's irrelevant and argumentative. Thanks in advance.
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Old 09-07-2011, 02:46 PM   #70
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Originally Posted by j0nx
I was really hoping the '12 would provide much better fuel mileage with the new motor but man these things don't appear to be getting anywhere near their advertised highway mpg ratings from what I'm seeing in this thread. I would like to average 20mpg on my daily commute to justify one. What options should I steer clear from to maximize fuel mileage? And please no comments from anyone about how 'you shouldn't buy a wrangler if you want fuel mileage' because that's irrelevant and argumentative. Thanks in advance.
Get a 2 door sport with 3.21 gears for best mileage.

I got mine with 4.10 rear because I knew 35s would be installed. I didn't buy this for mileage and good thing as I get 16 in town and on the highway.
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Old 09-07-2011, 02:48 PM   #71
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Ahhh...I've been looking for that kinda info.

If you are running 4.10's on a 2012 auto...are you running at 2500 RPMs?
4.10's on a 2012 and yes running 2500 rpm, even after adding 100 pounds of weight ( ACE rock rails ) still avg. 16.9 mpg.... last fill up gave me 17.3 mpg combo driving (highway and city).
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Old 09-07-2011, 02:54 PM   #72
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My 2012 Rubi (when it arrives) will replace my 2011 F350 dually, currently getting 14 mpg diesel. It's a safe bet I'll see an improvement.
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Old 09-07-2011, 03:10 PM   #73
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What about the wheel size though ranjr? I assume the 18" wheels on the sahara will drastically reduce mpg? I was thinking an unlimited sport with auto and 17" wheels or maybe a sahara with 17" wheels if I can get one without the larger wheels but I can't really swing the extra $3-5k for the sahara if I buy now so it will probably be a sport. This is assuming I'm correct about the wheel sizes but from what I've read I think that's what I understand?
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Old 09-07-2011, 03:11 PM   #74
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Originally Posted by Mykll View Post
Date: 8/21
Odo: 270
Gallons: 16.19
Price: $3.459
Total: $56.00
Computer MPG: 18.0
Actual MPG: 16.31

Date: 8/27
Odo: 536
Gallons: 16.467
Price: $3.399
Total: $55.97
Computer MPG: 16.7
Actual MPG: 16.15
Filled it up twice more.

Date: 9/03
Odo: 802
Gallons: 15.722
Price: $3.479
Total: $54.70
Computer MPG: 17.2
Actual MPG: 16.92

Date: 9/07
Odo: 1110
Gallons: 16.173
Price: $3.439
Total: $55.62
Computer MPG: 19.6
Actual MPG: 19.04

Need to re-read the break-in procedures, but I have slowly been doing less and less peppy break-in driving, less just aimlessly driving around, and more just normal 90/10 city/highway driving. Since I filled up this morning, it has been 100% city driving, and the computer reads about 19.5 mpg. Today however, for the first time, front two panels off and no AC running.
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Old 09-07-2011, 03:19 PM   #75
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What about the wheel size though ranjr? I assume the 18" wheels on the sahara will drastically reduce mpg? I was thinking an unlimited sport with auto and 17" wheels or maybe a sahara with 17" wheels if I can get one without the larger wheels but I can't really swing the extra $3-5k for the sahara if I buy now so it will probably be a sport. This is assuming I'm correct about the wheel sizes but from what I've read I think that's what I understand?
The "rim" size won't matter (outside of the difference between the weight of wheel/tire combo or tread design). The 18 inch Sahara wheels have lower profile tires thatn the 17's on the Rubi and Sport....but the overall wheel diameter is the same 32 inches.
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Old 09-07-2011, 03:27 PM   #76
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I was really hoping the '12 would provide much better fuel mileage with the new motor but man these things don't appear to be getting anywhere near their advertised highway mpg ratings from what I'm seeing in this thread. I would like to average 20mpg on my daily commute to justify one. What options should I steer clear from to maximize fuel mileage? And please no comments from anyone about how 'you shouldn't buy a wrangler if you want fuel mileage' because that's irrelevant and argumentative. Thanks in advance.
Keep in mind that some of these are still being broken in....and some have already been modded with heavy winches and bumpers. Plus some are running 4.10's.

If you are looking for a commuter....well...I guess a 2 door stick with 3.21's will be your best bet. But that also depends on your commute. If you never get above 50 mph and/or do a lot of stop and go driving, you may be better off getting 3.73's anyway.

I'm looking at some 4 doors, auto, and going back and forth between 3.21's and 3.73's.
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Old 09-07-2011, 05:25 PM   #77
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Originally Posted by j0nx
What about the wheel size though ranjr? I assume the 18" wheels on the sahara will drastically reduce mpg? I was thinking an unlimited sport with auto and 17" wheels or maybe a sahara with 17" wheels if I can get one without the larger wheels but I can't really swing the extra $3-5k for the sahara if I buy now so it will probably be a sport. This is assuming I'm correct about the wheel sizes but from what I've read I think that's what I understand?
The size of the wheels is not as important as the weight of the wheel and tire combined. I'm going to make a guess that the Sahara 18s will weigh more than the basic (non S package) Sport 17s.

I honestly would be more concerned about the other differences between the Sport and Sahara to decide which you want. If the Sahara has the features you're after, save up some money to get it. Buy what you really want or you won't be happy. It's easier to change tires and wheels than adding connectivity group, auto a/c, and some of the other features only found on the Sahara and Rubicon.
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Old 09-07-2011, 05:35 PM   #78
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JKU Sahara with 3.21 gears. 450 miles as of today. First tank I got 16.5 mpg. All around town. (little highway)

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Old 09-07-2011, 05:46 PM   #79
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The size of the wheels is not as important as the weight of the wheel and tire combined. I'm going to make a guess that the Sahara 18s will weigh more than the basic (non S package) Sport 17s.

I honestly would be more concerned about the other differences between the Sport and Sahara to decide which you want. If the Sahara has the features you're after, save up some money to get it. Buy what you really want or you won't be happy. It's easier to change tires and wheels than adding connectivity group, auto a/c, and some of the other features only found on the Sahara and Rubicon.
Basic Sport comes with 16s, and slightly smaller overall tire diameter. Sport S comes with 17s and same diameter as Sahara 18s.
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Old 09-07-2011, 06:01 PM   #80
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Basic Sport comes with 16s, and slightly smaller overall tire diameter. Sport S comes with 17s and same diameter as Sahara 18s.
Sounds like that's the answer then. I was never interested in the basic JK so I wasn't sure. Thanks for clarifying.
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Old 09-07-2011, 06:52 PM   #81
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I have a 2012 JK Sahara. I've been driving about 550 miles and my display reads 18.5 mpg. I do about half highway / half city.
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Old 09-07-2011, 09:49 PM   #82
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JK Sahara / Auto / 3.21
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I seem to be getting around 16-17 mpg or just under with mixed driving mostly around town. Perfect conditions and driving near the speed limit on a highway trip = 20 mpg. I'm thinking the lift and tires are costing me about 1 - 1.5 mpg overall.

Top and doors off seems to cost 2 mpg or so.
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Old 09-08-2011, 08:07 AM   #83
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I was really hoping the '12 would provide much better fuel mileage with the new motor but man these things don't appear to be getting anywhere near their advertised highway mpg ratings from what I'm seeing in this thread. I would like to average 20mpg on my daily commute to justify one. What options should I steer clear from to maximize fuel mileage? And please no comments from anyone about how 'you shouldn't buy a wrangler if you want fuel mileage' because that's irrelevant and argumentative. Thanks in advance.
Once these new motors are broke in I'm sure 20 mpg will be possible. It's still pretty impressive that they can gain hp and torque over the 3.8 and still save gas. Unlike some vehicles I have owned, there mpg ratings on the window are very accurate. Other vehicles I have had you could get 5 or more better mpg's then the rating if you where driving conservative. Just don't expect to pull 20+ mpg if you like driving over 75 mph. Just too much aero drag from the windshield. There highway rating must not take into consideration the 70 and 75 mph speed limits. Either that or it includes chances to draft other vehicles.
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Old 09-08-2011, 03:30 PM   #84
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The highway rating must not take into consideration the 70 and 75 mph speed limits. Either that or it includes chances to draft other vehicles.
Like you, I thought that the highway mileage numbers were from just getting out on the road at some fixed speed and keeping it there for the duration of the test. You got me curious enough to check, and the answer is a lot more complex than I thought. It's actually a mix of 5 different tests over almost 50 miles of travel. Max speed is 80 and it includes some hard acceleration runs.

EPA testing procedure through 2007
Two separate fuel economy tests simulate city driving and highway driving: the "city" driving program or Urban Dynamometer Driving Schedule or (UDDS) is defined in 40 C.F.R. 86 App I and consists of starting with a cold engine and making 23 stops over a period of 31 minutes for an average speed of 20 mph (32 km/h) and with a top speed of 56 mph (90 km/h).
The "highway" program or Highway Fuel Economy Driving Schedule (HWFET) is defined in 40 C.F.R. 600 App I and uses a warmed-up engine and makes no stops, averaging 48 mph (77 km/h) with a top speed of 60 mph (97 km/h) over a 10 mile (16 km) distance.

The measurements are then adjusted downward by 10% (city) and 22% (highway) to more accurately reflect real-world results. Here are graphs showing the speeds they're run at.

The "city" or Urban Dynamometer Driving Schedule (UDDS) used in the EPA Federal Test Procedure



The Highway Fuel Economy Driving Cycle (HWFET) used in the EPA Federal Test Procedure



EPA testing procedure: 2008 and beyond

As a means of reflecting real world fuel economy more accurately, the EPA adds three new tests[34] that will combine with the current city and highway cycles to determine fuel economy of new vehicles, beginning with the 2008 model year[35]. A high speed/quick acceleration loops lasts 10 minutes, covers 8 miles (13 km), averages 48 mph (77 km/h) and reaches a top speed of 80 mph (130 km/h). Four stops are included, and brisk acceleration maximizes at a rate of 8.46 mph (13.62 km/h) per second. The engine begins warm and air conditioning is not used. Ambient temperature varies between 68 F (20 C) to 86 F (30 C). The air conditioning test raises ambient temperatures to 95 F (35 C), and the vehicle's climate control system is put to use. Lasting 9.9 minutes, the 3.6-mile (5.8 km) loop averages 22 mph (35 km/h) and maximizes at a rate of 54.8 mph (88.2 km/h). Five stops are included, idling occurs 19 percent of the time and acceleration of 5.1 mph/sec is achieved. Engine temperatures begin warm. Lastly, a cold temperature cycle uses the same parameters as the current city loop, except that ambient temperature is set to 20 F (−7 C).
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Old 09-08-2011, 04:20 PM   #85
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12 Sport w/373s 6 speed mostly hwy and I`m getting 22.6 which is considerably better than my 07 Rubi auto was.
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Old 09-09-2011, 12:06 AM   #86
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2012 Jku. About 1000 miles odo. Cruising farm roads at 60 mph for a 160 mile trip, I got 23.7 mpg per evic. 2012 with auto, 3.73 and 32's. Above 65-70 mileage drops.
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Old 09-09-2011, 12:41 AM   #87
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I get 16.5 mpg in my 2012 JKUR 4.10 stock. I drive 60% freeway at 60-70 mph and 40% city at 30-45 mph. I'm not impressed by the mileage but I do enjoy the vehicle more than my 97 TJ. When I’m in 4H in loose sand up and down sand dunes I get 8 mpg.

Hope this helps!
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Old 09-09-2011, 08:31 AM   #88
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2012 Jku. About 1000 miles odo. Cruising farm roads at 60 mph for a 160 mile trip, I got 23.7 mpg per evic. 2012 with auto, 3.73 and 32's. Above 65-70 mileage drops.
Good info...thanks!
What type of drop are you seeing at the higher speeds?
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Old 09-12-2011, 01:21 AM   #89
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First 2/3 tank of gas for lead-foot wife's 2012 Unlimited Sport S, auto with 3.21: 192 in-town miles at 14.4 mpg per evic and exactly the same based on calculations at the pump. I was worried.

Today we drove almost 400 highway miles. No head or tail wind, 90+ temps, windows closed and a/c running. A couple observations:

Cruise control at 75 really pulls the gas pedal to the floor for every hill and overpass, often downshifting a gear to maintain speed. That eats gas, pulling mileage on the evic down to mid 17's over a 60 mile stretch.

Driving without the cruise was much better. On the way home I tried 30 minute runs at different speeds. results from the evic:

30 min at 55 mph = 25.6 mpg
30 min at 65 mph = 23.5 mpg
30 min at 70 mph = 20.6 mpg (rpms at 70 mph were right at 2,000)
30 min at 75 mph = 18.6 mpg
I ran about 15 min at 80 mph but there was too much slower traffic to maintain this and speed limits dropped before I got any good evic data.

Overall return trip was 186 miles and pump showed 9.1 gallons, calculating to 20.4 mpg. Total vehicle mileage is only 630, so we expect to see this improve as the engine continues to loosen up.
YMMV
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Old 09-12-2011, 08:33 AM   #90
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First 2/3 tank of gas for lead-foot wife's 2012 Unlimited Sport S, auto with 3.21: 192 in-town miles at 14.4 mpg per evic and exactly the same based on calculations at the pump. I was worried.

Today we drove almost 400 highway miles. No head or tail wind, 90+ temps, windows closed and a/c running. A couple observations:

Cruise control at 75 really pulls the gas pedal to the floor for every hill and overpass, often downshifting a gear to maintain speed. That eats gas, pulling mileage on the evic down to mid 17's over a 60 mile stretch.

Driving without the cruise was much better. On the way home I tried 30 minute runs at different speeds. results from the evic:

30 min at 55 mph = 25.6 mpg
30 min at 65 mph = 23.5 mpg
30 min at 70 mph = 20.6 mpg (rpms at 70 mph were right at 2,000)
30 min at 75 mph = 18.6 mpg
I ran about 15 min at 80 mph but there was too much slower traffic to maintain this and speed limits dropped before I got any good evic data.

Overall return trip was 186 miles and pump showed 9.1 gallons, calculating to 20.4 mpg. Total vehicle mileage is only 630, so we expect to see this improve as the engine continues to loosen up.
YMMV
Thank you thank you thank you....
This was the exact type of info I was looking for.


I would think that at 75mph, your RPM's would be high enough to keep you from downshifting...but I guess not. Looks like a pretty big drop-off between 65 and 70....but that is kinda expected with a 4000 brick on wheels.
Thanks!
Hopefully someone can post similar info with 3.73's on an auto....

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