Sudden gas mileage drop - JeepForum.com

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post #1 of 16 Old 07-22-2008, 04:18 PM Thread Starter
woodie416
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Sudden gas mileage drop

So i got this problem. I used to average around 15-16 mpg city in my xj, but this last week or two i have been averaging around 10-12 mpg city. so could anyone tell me something that could be going on to cause this? and could you also tell me what your average mpg is. Thanks guys

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post #2 of 16 Old 10-19-2008, 07:18 PM
floridamud
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i have the same problem right now, i dropped from 19mpg to 8mpg in one week, i think it might be the 02 sensors but i dont know

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post #3 of 16 Old 10-19-2008, 07:24 PM
footypaul
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Lot of places are going to 'winter blend' gas right now, and that will adversely affect MPG>
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post #4 of 16 Old 10-19-2008, 08:01 PM
danno627
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Quote:
Originally Posted by footypaul View Post
Lot of places are going to 'winter blend' gas right now, and that will adversely affect MPG>

agreed. every winter I go from 15-16 to like 12. when they switch back to summer blend mpgs increase
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post #5 of 16 Old 10-19-2008, 08:57 PM
compfreak530
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Quote:
Originally Posted by footypaul View Post
Lot of places are going to 'winter blend' gas right now, and that will adversely affect MPG>
makes alot of since. gas here just hit 2.79 a gallon. so it figures the cheaper stuff gets crappier mileage
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post #6 of 16 Old 10-19-2008, 09:09 PM
xjpro
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I think we are all suffering from the same. The mileage on my XJ has dropped from around 17 to 12 mpg which is driving me crazy. No CEL light whatsoever and everything seems to be ok, but I guess that our problem is that ďwinter blend gasĒ
So for this time letís not blame our XJís!!!

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post #7 of 16 Old 10-19-2008, 09:14 PM
footypaul
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Originally Posted by compfreak530 View Post
makes alot of since. gas here just hit 2.79 a gallon. so it figures the cheaper stuff gets crappier mileage
Technically, the winter blend is more costly than the regular summer stuff. Oil prices are just dropping so quick right now that it doesnt show.
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post #8 of 16 Old 10-19-2008, 11:13 PM
crcashman
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I had been getting about 11-13 MPGs on Chicago's blend. I filled up a week after moving and got 16 MPG on the first tank. A few weeks later I did a basic tune-up and I've been getting a pretty consistent 19-20 in mixed driving and about 23 on highway trips. Its all in the blend.
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post #9 of 16 Old 10-20-2008, 04:11 AM
mecompco
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Yup, mine has nose-dived in the past couple weeks as well, as it does every winter. I'm sure due to running winter blend, truck doesn't heat up as quickly in colder weather so spends longer time running rich, may keep ideling longer for heat, tire pressue goes down, etc., etc.

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post #10 of 16 Old 10-20-2008, 06:06 AM Thread Starter
woodie416
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Quote:
Originally Posted by xjpro View Post
I think we are all suffering from the same. The mileage on my XJ has dropped from around 17 to 12 mpg which is driving me crazy. No CEL light whatsoever and everything seems to be ok, but I guess that our problem is that ďwinter blend gasĒ
So for this time letís not blame our XJís!!!
haha yeah man for once its not the xj's fault

99 XJ-3.5" Rubicon Express, 31" Duratracs, Black Rock wheels, Bushwacker Flares, Camo Headliner
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post #11 of 16 Old 10-21-2008, 07:08 AM
namichael
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I had no idea that the blend of gas could play such a roll in MPG. Mine is doing the same thing. I thought that something may have been wrong with the XJ, because I had just recently changed the oil, air filter, replaced the PCV hose, and ran some fuel injector cleaner through it and then the loss of MPG.

Glad to see it's not just me.

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post #12 of 16 Old 10-21-2008, 07:57 AM
BigD 275
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Yep, definitely the gas (as long as the car seems to be running properly other than the mpg decline).

I lose about 3-4 mpg every year once the gas stations start carrying the winter blend gas.

Also, the problem is on a cold start up as well. The computer is telling the engine to use more fuel until it reaches operating temperature, which obviously takes longer when it is cold outside.

99 Jeep Cherokee Limited
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post #13 of 16 Old 10-21-2008, 09:02 AM
rust64
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I wonder if it might help to disconnect the battery, and wipe the computer memory. Maybe it would help to let the computer relearn its' optimum settings. Don't know for sure, but it doesn't cost anything to try it.
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post #14 of 16 Old 10-21-2008, 11:19 AM
jebmccall
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hmmm i am having opposite affects here in ga, mine went up about 2
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post #15 of 16 Old 10-21-2008, 06:46 PM Thread Starter
woodie416
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Quote:
Originally Posted by jebmccall View Post
hmmm i am having opposite affects here in ga, mine went up about 2
lucky you man!!

99 XJ-3.5" Rubicon Express, 31" Duratracs, Black Rock wheels, Bushwacker Flares, Camo Headliner
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