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Mine does the same thing. The reserve light came on this week and when I went to fill it up it took 17 gallons. My BMW app said I had 3 gallons left in the tank. According to BMW, the gas tank capacity is 22.4 gallons. I’ve concluded that the light and the app are conservative on the amount of gas left in order to avoid running the tank empty.
Congrats on your new M.
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