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Old 06-23-2015, 08:31 AM   #121
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2014 3.73, 6 spd manual. In stock trim, around 20. As is, heavy bumpers, winch, sliders, tire carrier, 1.5 rk lift, no doors, no top, around 17.5. Still have stock tires

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Old 06-23-2015, 10:05 AM   #122
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My '08 jk 3.8L gets about 14mpgs at best with 35s Geolanders. It's like gas prices I don't bother looking anymore. Lol

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Old 06-23-2015, 10:06 AM
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Getting about 16mpg, mostly around town. 2014 JKU Willys, 3.73, 6MT, 2.5" lift, 35" Duratracs
I like your setup... Have any pics to share?
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Old 06-23-2015, 10:11 AM   #124
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I like your setup... Have any pics to share?
Not many on my work computer...here's a pic I snapped the other day just running some errands. I've been really pleased with the setup.

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Old 06-23-2015, 10:13 AM   #125
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15 JKUR 14.2MPG in town. 315/75R17 MT Deegan 38, Smittybilt SRC bumpers.
Before I bought my programmer it showed I was getting around 11MPG.
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Old 06-23-2015, 10:14 AM   #126
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22 highway 19-20 mix of highway/city 17-18 just around town
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Old 06-23-2015, 10:28 AM   #127
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2015 JKU Sahara all stock with Hardtop 3.73 gears Auto average 16/17 city and 21 highway 65MPH before I added a K&N filter now I get 17/18 city and 22 highway 65MPH.

I saw a post here that said to "calibrate your throttle" and you turn on key (not crank) wait for all the lights to go off and SLOWLY press the gas pedal all the way to the floor and just as SLOWLY release the gas pedal and turn key to off position.

Start and go for drive. I noticed a slight difference in throttle response and happy with my gas mileage.
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Old 06-23-2015, 10:29 AM   #128
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09' jkur 17 on trip last week. Variety of highway to seasonal Rds, v little in 4x4. Seasonals were in good shape lol.
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Old 06-23-2015, 11:51 AM   #129
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5) to keep momentum in sixth gear, try to using the low end torque as much as possible (works better on flat surfaces)
What engine did you swap in to give you low end torque to use? Neither the 3.8 nor the 3.6 have bupkis for power below 2,000 RPM.
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Old 06-23-2015, 12:08 PM
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What engine did you swap in to give you low end torque to use? Neither the 3.8 nor the 3.6 have bupkis for power below 2,000 RPM.
It works

I have the stock engine. 260 lb-ft is enough to keep the momentum up at 40-50 mph in 6th; hovering around 1200 rpm. Although, there is constant shifting. It's a skill I learned from a couple of independent truck drivers awhile ago. Try it and let me know if it works for you. I need feed back
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Old 06-23-2015, 01:00 PM   #131
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It works

I have the stock engine. 260 lb-ft is enough to keep the momentum up at 40-50 mph in 6th; hovering around 1200 rpm. Although, there is constant shifting. It's a skill I learned from a couple of independent truck drivers awhile ago. Try it and let me know if it works for you. I need feed back
Neither the 3.8 nor the 3.6 make anywhere near 260 ft-lbs at 1,200 RPM. The Pentastar only touches 260 ft-lbs at it's peak, around 4200 RPM. At 1,200 RPM you're not even getting 200 ft-lbs out of either engine. You don't get decent torque out of the Pentastar until you hit 2,000 RPM. Have you never noticed the "surge" of power you get when you finally get to 2,000 RPM?

You can't drive a Pentastar like you do a diesel truck. The torque curves of the engines are night and day different.
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Old 06-23-2015, 01:32 PM   #132
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Looking at a lot of these averages is making me sad, but I suppose it probably makes sense in my situation.

I live in Los Angeles and am sitting in stop and go traffic most of the time. The only mods I have are 33" x 12.5" tires, Barricade Rock Sliders, and a Teraflex hinge (so a bit more weight).

My current average is 12.5 MPG. Halp!

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Old 06-23-2015, 02:15 PM   #133
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I average about 18.5 hand calculated on mostly two lane country roads. 2014 JKUR 4.10, Auto, on 33'' 15s.
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Old 06-23-2015, 04:38 PM
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Neither the 3.8 nor the 3.6 make anywhere near 260 ft-lbs at 1,200 RPM. The Pentastar only touches 260 ft-lbs at it's peak, around 4200 RPM. At 1,200 RPM you're not even getting 200 ft-lbs out of either engine. You don't get decent torque out of the Pentastar until you hit 2,000 RPM. Have you never noticed the "surge" of power you get when you finally get to 2,000 RPM? You can't drive a Pentastar like you do a diesel truck. The torque curves of the engines are night and day different.
Sorry for the confusion... I meant to say that Pentastar is rated at 260 ft-lbs of torque. It actually reaches 260 ft-lbs at 4800 rpm. Regardless, you can benefit from torque at low RPMs. It may not get you up a hill, but it'll keep you moving and saving fuel. Do you have a manual?
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Old 06-23-2015, 05:18 PM   #135
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The Pentastar has 90% of its peak torque at 1600-1800 rpm (234 ft/lbs). So while it peaks at 4800 there's still a good chunk available below 2000 rpm. That "surge" felt above 2000 rpm is the flat torque curve delivering more and more horsepower (more work getting done) as the valve timing adjusts and you head up the rpm range. If anything it's gearing and shift points that need tweaking to give a JK a performance feel.....if that's what floats yer boat. But it's a Jeep not a Jag.
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Old 06-23-2015, 06:49 PM   #136
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2014 3.8, 3.73 and auto Rubicon X...lucky if I pull 16 in the city and I don't think I've ever seen it over 17 at 70+ mph on the highway...what is going on?
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Old 06-23-2015, 06:54 PM   #137
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After owning a 2010 JKU and now my '15 JK WILLYS with 3.73, I'm so happy with the performance I can't express it.

First thousand miles down and I'm seeing just over 18mpg. (19 on the computer). Approx 30% highway and the balance rural roads. I'll take that from this big box!

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The Pentastar has 90% of its peak torque at 1600-1800 rpm (234 ft/lbs). So while it peaks at 4800 there's still a good chunk available below 2000 rpm. That "surge" felt above 2000 rpm is the flat torque curve delivering more and more horsepower (more work getting done) as the valve timing adjusts and you head up the rpm range. If anything it's gearing and shift points that need tweaking to give a JK a performance feel.....if that's what floats yer boat. But it's a Jeep not a Jag.
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Old 06-23-2015, 08:52 PM   #138
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2013 JKUR with full bumper/winch and last week on a high camping trip 160 miles from mountain home, avg of 19.6, best was almost 23mpg but that was for dropping 4K feet back home. As good as the prior 4 cylinder you had to push to keep up with traffic.
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Old 06-23-2015, 09:10 PM   #139
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08 2 door, pretty much stock except for 18" wheels & 32" Yokohamas (supplied by the dealer). Last tank was 16.5 mostly on city streets, a little highway, and not trying out run the Vette crowd. Being a geezer, I can drive like a geezer!!! Wave back, or I'll let you know you're "Number 1"!!
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Old 06-23-2015, 10:33 PM   #140
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Same setup and roads as Bamafann686's but stock Rubicon tires... about 19.1 average, that's pretty good with the 4.10 option right?

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Old 06-24-2015, 02:41 AM   #141
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Is there something I can do to test that my JKU isn't eating an excessive amount of gas for some unknown reason? The gauge says 12.5 and seeing all these 15-19mpg numbers is making me think something is wrong.
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Old 06-24-2015, 02:51 AM   #142
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Actually...reading through this thread has been helpful:
https://www.wranglerforum.com/f274/ho...e-1282481.html
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Old 06-24-2015, 03:01 AM   #143
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My yj is my daily driver...it gets 9. When I'm looking for economy I drive the JK minivan, it gets 14.
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Old 06-24-2015, 06:09 AM   #144
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2015 JKUHRR. 14-16 MPG mixed local driving in the Appalachian foothills. Stock, 410's
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Old 06-24-2015, 07:33 AM
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JK minivan.
Why do have to be so hurtful? :-)
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Old 06-25-2015, 07:24 AM   #146
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18.2 second week of dd my new wrangler sport 3.73 6spd and 29 inch tires

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Old 06-25-2015, 08:52 AM   #147
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18.2 on the way to work this morning. 2014 JKU, 2.5" lift on 35's with 3.21's. It's a daily driver for my 90/day commute. It'll spike to 19 sometimes, but mostly hoovers around 18.
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Old 06-25-2015, 09:13 AM   #148
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My, what has become an "addiction" to 23+mpg is what has kept my "Mod Bug" at bay. I drive about 80 miles a day and getting like 435 miles on a tank has me in its grasp.
Wow are you kidding? I have the basic Sport and best I've gotten on a tank is 300. Usually, I'm at 17MPG on avg and I've gotten to 20 highway at speeds between 65/75. Never gotten past 20.
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Old 06-25-2015, 09:30 AM   #149
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Wow are you kidding? I have the basic Sport and best I've gotten on a tank is 300. Usually, I'm at 17MPG on avg and I've gotten to 20 highway at speeds between 65/75. Never gotten past 20.
I'm starting to wonder if this Jeep is some kind of "Factory Freak" (that's what we used to call vehicles, usually muscle cars that came from the factory performing above the norm).
I just filled up and checked the MPG with a calculator (computer was damn close) got 22.3 on the last tank.
Just drove to work (42 miles) and the computer so far is at 25.4, now that will drop as I mix things up (town/Hywy) but I consistently go 410-430 miles before I stop and get gas again which for me is the biggie. I drive a lot and its nice not having to stop every 2 days. My last Rubicon I'd get 200 miles before my light came on.
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Old 06-25-2015, 11:20 AM   #150
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I'm starting to wonder if this Jeep is some kind of "Factory Freak" (that's what we used to call vehicles, usually muscle cars that came from the factory performing above the norm). I just filled up and checked the MPG with a calculator (computer was damn close) got 22.3 on the last tank. Just drove to work (42 miles) and the computer so far is at 25.4, now that will drop as I mix things up (town/Hywy) but I consistently go 410-430 miles before I stop and get gas again which for me is the biggie. I drive a lot and its nice not having to stop every 2 days. My last Rubicon I'd get 200 miles before my light came on.
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