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Unread 01-04-2012, 09:40 AM   #1
zup28w
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Poor Gas Mileage - 08 Patriot Sport 2WD

Hi all,

My brother's g/f has an 2008 Patriot Sport with the 2.0L engine. Installed K&N air filter a little while ago. It's auto, 2wd, and has about 30k miles on it.

She lives in Connecticut so she's dealing with winter weather and some hills. She's getting around 14 city and 16 highway. Seems a bit low even with winter gas.

Any suggestions on why it's so low? She's never changed the plugs and I think she's going to get that done to see if it helps.

Greg

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Unread 01-04-2012, 11:17 AM   #2
Gramps
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That's the mileage on mine when it took a nose dive too. I can't explain why it does it but disconnecting the battery for about half an hour resets the computer. You may have to repeat this several times before it really gets back to normal.
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Unread 01-04-2012, 11:55 AM   #3
FujativeOCR
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Just a thought based on something I learned from my Volvo which needed regular computer resets. You can do the battery disconnect reset simply by pulling the associated computers fuse from the fusebox for a few minutes. Way easier. On the patriot Im not sure what the computer is called, and Im not near enought to look, but on the Volvo it was like PCM, or something like that.
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Unread 01-04-2012, 11:59 AM   #4
zup28w
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Quote:
Originally Posted by Gramps View Post
That's the mileage on mine when it took a nose dive too. I can't explain why it does it but disconnecting the battery for about half an hour resets the computer. You may have to repeat this several times before it really gets back to normal.
Hi Bob,

Thanks for the reply. When you said you got the same mileage, was that was displayed by the computer or what you actually got when making your own calculations? I've read some WK posts where people suggest unhooking the battery to reset the computer but figured it was more for the electronic display, not the actual mileage.

Thanks again!

Greg
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Unread 01-04-2012, 11:59 AM   #5
zup28w
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Thanks FujativeOCR,

Good idea!

Greg
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Unread 01-05-2012, 09:34 AM   #6
Gramps
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I didn't actually calculate the mpg but I was getting less miles per fill up. Others have tried this too and it works. This was a summer trip from WI down to TN so I could actually watch the mpg drop off mile after mile and I did several 'disconnect' tricks while running around. It never really stabilized until I got back home again. The dealer said it was probably bad gas but I filled up at many different stations and they couldn't all have had bad gas.
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