Update: I filled up yesterday and measured exactly 82L total. That gives me over 1/1 on the gauge. That only is 21.66 gallons which I've added more than that. I think the official capacity is 92 or something so it is curious why the OBC reports 10 less. I thought maybe was that "zero" was when the light comes on but the light comes on at 8L or 10L in OBC.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)