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Unread 10-31-2010, 01:58 PM   #1
newman_buddy
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MPG recently Yo-yo'd

I have an 06 LJ Rubicon I bought about 16 months ago. I have been getting very low gas milage compared to past jeeps I have had. I bought it stock and it got about 13-14 mpg and since put 33's on it and is getting about 12 mpg. I know jeeps are terrible on gas but that has seemed low to me. Recently I filled up and 3 tanks in a row for the first time I got about 17 mpg without changing anything else and driving the same. Now it is all of a sudden back to 12 MPG.

Anybody have any ideas why it would fluctuate so much or is so bad to begin with. I am thinking cracked exhaust header or bad o2 sensors.

Thanks

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Unread 10-31-2010, 02:00 PM   #2
g4x4xgeoff
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driving habits maybe?

i gave up on trying to pay attention to my mileage. its sad and often a mystery like this
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Unread 10-31-2010, 02:02 PM   #3
newman_buddy
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No, I have been driving exactly the same and making sure to pay attention to keeping it the same.
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Unread 10-31-2010, 02:02 PM   #4
MigueloP
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maybe bad maths.....
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Unread 10-31-2010, 02:03 PM   #5
del_TJ
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I've noticed a fluctuation at times too. Cleaning my air filter helped out once but it's gone between 13 - 17 mpg since then. It might just be my driving habits... or an electrical sensor gremlin.
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Unread 10-31-2010, 02:04 PM   #6
newman_buddy
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No, I triple checked that.
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Unread 10-31-2010, 02:12 PM   #7
XXRider
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Does gas you are purchasing contain ethanol? It contains less energy than 100% gas, so you get less HP and MPG.
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Unread 10-31-2010, 03:50 PM   #8
sh13lds21
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are you getting gas at the same station? i noticed that when i get gas at the casino i notice about a 1/2 to 1 mile loss per gallon compared to when i get gas at the chevron station. thats just what ive noticed
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Unread 10-31-2010, 04:55 PM   #9
Knuckelhead
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Quote:
Originally Posted by newman_buddy View Post
since put 33's on it and is getting about 12 mpg.
Did you regear?
Have you corrected the speedometer?...
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Unread 10-31-2010, 05:11 PM   #10
the_art_of_desi
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probably winter gas... they add more ethanol to keep the lines from freezing up, thus the reduction in mileage every october...
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Unread 10-31-2010, 07:15 PM   #11
dougiefresh131
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Quote:
Originally Posted by the_art_of_desi View Post
probably winter gas... they add more ethanol to keep the lines from freezing up, thus the reduction in mileage every october...
i never really thought about that. but that makes sense. august/september i was getting about 17. during october i was getting 14/15...but now its back up to 17.
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Unread 10-31-2010, 07:36 PM   #12
Zeep
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Quote:
Originally Posted by newman_buddy View Post
No, I have been driving exactly the same and making sure to pay attention to keeping it the same.


I have a '05 version of the same rig. I have always been anal about recording fill-ups, oil changes, etc. I am convinced that wind direction + speed, will effect fuel economy.
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Unread 10-31-2010, 07:58 PM   #13
newman_buddy
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The speedo has been adjusted.

I am not sure what gas station i got the gas at I will pay attention to that next time.

I am not sure about the ethanol either.


Its not the winter gas it is always bad. The hotter it gets out the worse. It was 110 out this summer and i was getting about 8 mpg
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Unread 10-31-2010, 08:05 PM   #14
kellyII
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Well I have been running 35's and getting 12mpg, I recently downsized to 33's and am curious to see what kind of mpg im getting now.

Either way its not good gas mileage...
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Unread 10-31-2010, 08:12 PM   #15
Knuckelhead
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Originally Posted by kellyII View Post
Well I have been running 35's and getting 12mpg, I recently downsized to 33's and am curious to see what kind of mpg im getting now.

Either way its not good gas mileage...
35" tires with 3:73's and the 42RLE wont help either...
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exhaust , header , mpg , o2 sensor

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