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Unread 04-28-2012, 10:17 PM   #31
4Doors
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1999 WJ 
 
Join Date: Jan 2007
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My running average as of late is 17.8 and that is combined city/highway on 4" lift and 32" tires (true story), but I've got my tires filled with helium so I float most of the time (this may be a fabrication). Give it a shot.

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Unread 04-29-2012, 07:10 AM   #32
cuttysark
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hahaha LOL

yeah if you want good mileage, dont buy a jeep.. my WJ 4.7 gets only about 10% better milage then my 97 ZJ 5.2 did. albeit i have to do a tune up probably but still.. only about 350 KM/tank
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Unread 04-30-2012, 05:47 PM   #33
rlordjr
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I have been paying close attention. On the way to school for carpool I will see 14 mpg. This is from cold start to 11 miles in mix of hwy and traffic. I reset computer at school and have over 20 mpg showing when reverse trip is finished and I am at work. Seems like operating temp is important
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Unread 04-30-2012, 08:22 PM   #34
nlynd1978
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Location: Mchenry county, Illinois, Illinois
Posts: 627
Just a little bit.
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Unread 05-08-2012, 09:05 PM   #35
wyattwj123
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2000 WJ 
 
Join Date: Feb 2012
Location: sarasota, florida
Posts: 259
calculated my tank mileage and i got 200 miles with a fuel tank thats horrible.. had to fill it up within 6 days i changed the spark plugs already fuel filter cleaned the air filter sea foamed i think i would no if it was a 02 sensor i need to get better gas
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Unread 05-08-2012, 09:28 PM   #36
mycreativename
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Why do you think you would know if the O2 sensor was bad? Are you some sort of sensor-whisperer?

That being said, you are at 100k+ miles without knowing if they've been changed, chances are they haven't been.

But I've gotta be honest with you, you do nothing but short trips, ~10mpg isn't really all out of the realm of normal for how your trips are. Before I was driving to college and to work, I was getting 11/12mpg consistently, heck even now with doing about half highway half stop and go, I only get 15mpg. It's a Jeep, you're not going to ever get "good" mileage.
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Unread 11-08-2013, 08:52 PM   #37
rchinsp
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I have a 2012 Jeep Grand Cherokee Overland that I bought new and now has 20,000 miles on it. I took it to my dealer for a oil change and asked him to stop the low tire PSI computer from flashing ( 3 of the 4 was flashing). Later I was told that my tires had Nitrogen in them and I had to go to the only tire store in town that could do this ( he said that due to my tires having a "Gray valve Stem" that my tires had Nitrogen in them). I was never told about Nitrogen in my tires until now. Did my Jeep come with the Nitrogen in them or was I sent to this Tire store to have Nitrogen put into my tires unnecessary.
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Unread 11-08-2013, 09:01 PM   #38
brianestep
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Quote:
Originally Posted by rchinsp View Post
I have a 2012 Jeep Grand Cherokee Overland that I bought new and now has 20,000 miles on it. I took it to my dealer for a oil change and asked him to stop the low tire PSI computer from flashing ( 3 of the 4 was flashing). Later I was told that my tires had Nitrogen in them and I had to go to the only tire store in town that could do this ( he said that due to my tires having a "Gray valve Stem" that my tires had Nitrogen in them). I was never told about Nitrogen in my tires until now. Did my Jeep come with the Nitrogen in them or was I sent to this Tire store to have Nitrogen put into my tires unnecessary.
Wrong forum friend. Try the WK2 threads. This is WJ, 1999-2004. We put american-made oxygen in our tires!
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Unread 11-09-2013, 08:18 AM   #39
Cirruslydakota
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Typically a green valve stem indicates nitrogen filled. I haven't heard of gray indicating that. My Mazda has the gray caps as well but its matched to my tpms. Take a picture if you have a chance.
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Unread 11-09-2013, 10:30 AM   #40
Jeeples
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Gray valve stems are typically used on vehicles equipped with TPMS sensors. Green usually denotes nitrogen.

Nitrogen is, IMHO, just a way for tire shops to make more money for very little gain to the consumer. Either take it back and tell him to fully deflate your tires and fill 'em will regular air or find a shop that's more competent.
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Unread 11-09-2013, 11:13 AM   #41
Idano12
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Quote:
Originally Posted by Jeeples View Post
Gray valve stems are typically used on vehicles equipped with TPMS sensors. Green usually denotes nitrogen.

Nitrogen is, IMHO, just a way for tire shops to make more money for very little gain to the consumer. Either take it back and tell him to fully deflate your tires and fill 'em will regular air or find a shop that's more competent.
Why deflate and refill ? You can just top them off with regular compressed air.
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Unread 11-09-2013, 02:24 PM   #42
rchinsp
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I double checked all of my Valve Stems again and all are Gray. But I discovered that two of the Stems had a White Center Cap (appears the other two Stems have lost their Center Cap) and with a Magnifying lens I was able to read in green letters across the White Cap that said "Nitro Fill". Thanks for helping.
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