Quote:
Originally Posted by MikeTerp
I had exactly the reverse happen. Took my '16 340 in for its first service and they said that there was a factory bulletin out about reflashing the memory. Supposedly they did that, and I found both power and gas mileage diminished. Took it back twice with no change. Frustrating.
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Interesting...this goes to show that there might be something that the dealers are doing intentionally or not, that either causes increase or decrease the car's gas mileage. It may be something that only the programmers are aware of, but not the mechanics who are just following what they're being told. I wonder if there is a "fuel efficient" code that can be done to ensure the settings are set to the best possible fuel efficient settings?