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re: Ot mechanics: gas mileage issue

Posted on 3/23/15 at 8:36 am to
Posted by VetteGuy
Member since Feb 2008
28345 posts
Posted on 3/23/15 at 8:36 am to
My guess is the loss is due from switchover to summer blends.

Run a different brand of gasoline, assuming you use the same brand all the time.

Another issue may simply be wear, or your cats are getting more restricted.
Posted by Butch Baum
Member since Oct 2007
2838 posts
Posted on 3/23/15 at 8:42 am to
Summer blend would make a change,
also may have to do with the oil,
no change in drive habits, more city?
Warmer weather lately running the a/c much?
check the air filter too...
Posted by DownshiftAndFloorIt
Here
Member since Jan 2011
66763 posts
Posted on 3/23/15 at 9:01 am to
My guess is a combination of using the AC more and possibly a shitty O2 sensor.

And as a hijack, I'm happy to report that my TDI is still improving at 27k miles. 49mpg average and climbing
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