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I let it get to about 8 miles on a road trip once. I read on here or another M5 board that it was risky to let it get too low because some people were having problems with some CEL or limp mode after filling back up. I got 400 miles on the tank and had 8 left on the range when I filled up. It was 20 gallons on the fill. I usually put about 18.5 on a fill.
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