Warning comes on at fifty miles of range left, but it's a warning without a nag screen (just the warning triangle). At 30 it will warn again and iDrive screen will have a nag warning until you refill.
A new car will have lower MPG, but most cars seem to be miserly on gas on a full tank and then appear to use up more at half tank. Not sure why, but seems to be the case with most modern cars, including BMW.
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