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I brought my 2014 Grand Cherokee in for an oil change (2/10/16) and the dealer also did a PCM Update to 18-094-15 from 18-094-11. I immediately noticed a reduction in my MPG by about 15% I asked if I could they can remove the update and bring it back to 18-094-11 and was told no. Has anyone encountered a reduction in MPG after the PCM update?
 

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I wonder if FCA is erasing any VW like cheating software with this update. Its all BOSCH anyway, so it would not surprise me.
I'm experiencing a reduction in my MPG also. Have been for a while - and it just occured that it was the PCM update and not my driving style changes. How do I get the GDE Tune?
 

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I had mine updated as well as the new cat converter (had no issues prior) as it is a 2014. Even in the winter time last year, I was getting close to 28mpg. This winter, and even now in the summer months, I barely average 25mpg...get about 550 miles to a tank now. Not impressed.
 
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