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Old 03-20-2013, 08:46 AM
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Gas mileage

I know this has been beat to death, but my TJ 4 cyl dropped to about 8.5 mpg and the check engine light was on. I ran by my local Auto Zone and they did a free diagnostic. I ended up spending about $105.00 for a new oxygen sensor, cap, rotor, plugs, and wires. Two hours later the check engine light was off and I was getting about 18.5 mpg!

Way to go me!
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Old 03-20-2013, 08:50 AM   #2
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Glad you got that 10 mpg jump. If the engine light was on, I'm guessing it was the oxygen sensor that was crapping out on ya!!

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Old 03-20-2013, 08:52 AM   #3
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G-Force..... What lift and tires are you running?
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Old 03-20-2013, 09:36 AM   #4
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I wish i fot 18 in my TJ. i did wheb it was stock but with the 3 inch lift and 31s it dropped right to about 15. My is the 4 banger also
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Old 03-20-2013, 11:23 AM
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I have a 2.5" lift with 31" X 11.5" all terrain tires filled to 50 psi. My upstream O2 sensor was bad and my plugs, rotor and cap were all truly in need of replacement. I did the wires for good measure.

I don't have a cold air intake and I have an aftermarket, but stock exhaust setup.
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Old 03-20-2013, 12:01 PM   #6
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Quote:
Originally Posted by G-Force View Post
I have a 2.5" lift with 31" X 11.5" all terrain tires filled to 50 psi.
Really? that seems crazy high to me???
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Old 03-20-2013, 02:17 PM
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They are rated to 55 psi. So I thought I would give it a try and harden them up a bit. I had been running them around 35 psi. Ride is rougher, but I think the harder tire drags less. I know they will wear faster, but I am due to replace these now anyway.

What pressure do you recommend?
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Old 03-20-2013, 05:02 PM   #8
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25-28ish...
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Old 03-20-2013, 05:19 PM   #9
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25 to 28ish what ?
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Old 03-20-2013, 05:46 PM   #10
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I always run my tires at max pressure for max MPG.. yes 50PSI rides rougher but much better MPG no doubt
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Old 03-20-2013, 07:38 PM   #11
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Quote:
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I always run my tires at max pressure for max MPG.. yes 50PSI rides rougher but much better MPG no doubt
I don't know who told you that but over inflated tires won't aid mpg.
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Old 03-20-2013, 07:40 PM   #12
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I don't know who told you that but over inflated tires won't aid mpg.
Obama said it would.
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Old 03-20-2013, 07:47 PM   #13
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25 to 28ish what ?
kpa.
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Old 03-20-2013, 07:52 PM   #14
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Obama said it would.
must obey king obama!

and go by the tire pressure on your door jam, not the tire
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Old 03-20-2013, 08:27 PM   #15
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I keep my 31's at 32psi. The guy at the oil change place pumped them to the rated 55 one time and I thought I was driving a basketball.
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Old 03-21-2013, 07:10 AM   #16
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Quote:
Originally Posted by mrpotatohead View Post
kpa.
Why would you think anything but PSI?

25-28KPA would be a flat...
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Old 03-21-2013, 08:18 AM   #17
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Why would you think anything but PSI?

25-28KPA would be a flat...
Sarcasm I suppose?!
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Old 03-21-2013, 10:25 AM   #18
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3' lift and 33's and I'm still gettin about 14mpg street, not really sure on highway as I haven't taken it on any long trips yet. Any other suggestions on raisin mpg besides cold air in take or chips?
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Old 03-21-2013, 02:26 PM   #19
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Sarcasm I suppose?!
It was early, sarcasm detector wasn't running...

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