I top off if I'm heading out on a relatively long trip (100+ miles), but normally, I let it get a notch or two under 1/4 before heading to the pump. Filling up at the half-tank level (aside from heading out on a long trip) seems like overkill to me. Never, ever had a problem with a BMW having "trash" in its gas tank that caused problems when running close to empty.
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2015 F80 ///M3 Sedan 7DCT Tanzanite, 2022 X3 sDrive30i 8AT Brooklyn Grey
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