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AZBMW Forums › Model Specific Discussion › 5-8 Series › Mpg drop
Mpg drop
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bmw325i
Cone Killer
Cone Killer

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Joined: May 29, 2007
Posts: 432

PostPosted: Thu Jun 08, 2017 2:11 pm
Post subject: Mpg drop

It's been a long time since I posted but work, family and plus the car has not been a major pain till NOw, lol.


My 97 540i auto with 248k now on the odometer has been dropping mpg like crazy. I used to get 21-22 mpg mixed driving. Now it's down to 8 mpg.

I can't smell or see any fuel leaks. The only code I am getting on my basic reader is P0430, I am thinking my cat is going out since it's rattling, but even with a bad cat can that be the cause of the mpg drop, more than half?


I don't have in depth code reader and can't tell if there is something more to it for the bad mpg. I scoured other forums but could not find anything related to my issue.

Another thing I am noticing is my speedo and mpg gauge are all over the place when I drive as well.
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