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Old 03-26-2014, 03:33 PM   #1
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Gas Mileage

Checked my gas mileage this morning. I'm getting 16 mpg with a 09 JKU with 3.8, four inch lift, heavy bumpers front and rear with winch and 33" tires. Surprised to see this. Figured more like 11 or 12 mpg. Should I be jumping for joy or is that about average?

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Old 03-26-2014, 03:37 PM   #2
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Jump for joy 15 is good 16 make my day ...

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Old 03-26-2014, 03:43 PM   #3
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That is above average for a 4" with bumpers. Why do you have so much lift for 33" tires?
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Old 03-26-2014, 04:09 PM   #4
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[QUOTE="spinlock;9364682"]That is above average for a 4" with bumpers. Why do you have so much lift for 33" tires?[/QUOTe

Like a lot of clearance. It's not that bad looking though. I have 3.73s and want to go to 35's but trying to stay away from the regear thing.
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Old 03-26-2014, 04:14 PM   #5
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That is above average for a 4" with bumpers. Why do you have so much lift for 33" tires?
What's your opinion on running 35s with 3.73s. I figured that a 33" tire was the cut off without regearing. I'm sure there is a RPM and power issue.
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Old 03-26-2014, 04:56 PM   #6
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12 to14 on my 2009 2dr that's built similar to the description of yours. I also have 4" in the front and 2" rear for an absolutely level stance.
3.73 and a 3.8 auto would be an absolute DOG.
Saving up for 4.88s before I go to 35s in the fall.
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Old 03-26-2014, 05:05 PM   #7
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Did you recalibrate after the lift and tires? After that, did you get these numbers by hand?
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Old 03-26-2014, 05:12 PM   #8
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Quote:
Originally Posted by Yeti83 View Post
Checked my gas mileage this morning. I'm getting 16 mpg with a 09 JKU with 3.8, four inch lift, heavy bumpers front and rear with winch and 33" tires. Surprised to see this. Figured more like 11 or 12 mpg. Should I be jumping for joy or is that about average?

With 33" tires thats probably right...throw some 35's on there and you will be closer to 14 MPG.
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Old 03-26-2014, 07:44 PM   #9
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Did you recalibrate after the lift and tires? After that, did you get these numbers by hand?
If your asking me then yes by hand. I did the ole math trick. My JKU does not have the MPH on the dash.
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Old 03-27-2014, 08:14 AM   #10
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If your asking me then yes by hand. I did the ole math trick. My JKU does not have the MPH on the dash.
What about the re-calibration?
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Old 03-28-2014, 09:39 AM   #11
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The other day, i had to drive from Cincy to Cleveland...reset the monitor as i got on the highway. With a light foot, cruise control the entire way, and a pretty serious tailwind, i averaged greater than 26 MPG. Also, Cincy to CLE is relatively flat.

On the way back, I duplicated the exercise and got about 22-23 mpg.

So...20+ mpg can definitely be done...

EDIT: forgot to mention, i am stock sahara tires, rims, and suspension...only difference is Rampage Recovery front bumper.
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Old 03-28-2014, 10:20 AM   #12
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I'm getting about 16.5 mpg average with my stock jkur. That's about 50/50 highway/city.

While driving 70-80 mph my gas mileage is 15-16 mpg.

Driving around the city I get about 16-17mpg.

Its not any better or any worse then what I expected to get. At least its better then the 4.7L v8 I had in a Toyota.

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