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Ya, I've gone from an average 36-38 to 33 since the stations switched to winter blend fuel and I threw on snow tires. Guessing that warming up the car for 5 min at work at night isn't helping much either! LOL!
 

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One easy thing you could try is some CRC Intake Valve cleaner.

CRC Intake Valve Cleaner

It's designed to clean up a GDI motor and might help things out.
Although I'm all for anything that will help,,,,,, I get weary really fast when I see statements like:

"Proven to remove up to 23% of carbon deposits!"
 
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