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2012 Mercedes-Benz E350 Questions

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It started declining when I had my transmission flushed at 47K miles. I now have 65K miles and all of my regular maintenance has been done. Nothing else seems to be wrong with the car.
What seems to make the problem better or worse? my avg gas mileage has been going down 24 now down to 19
How long have you had this problem? one year
Auxiliary battery malfunction light is on
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