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Hmm... I had not noticed that the thing stays powered when the car is off. I had assumed that the USB port in the center console is switched with the ignition. I will take a look at it later.
In my case, I am not too worried for my M3 since it gets driven almost daily but I have the same Tune2Air in my Aston and I only drive it a few times a week with occasional longer periods of inactivity.
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