All cars do this, when you go fill up it's always going to be 1 or 2 gallons below the actual gas tank size. Keep in mind that there is fuel in the system, like the fuel lines, etc.
The Range the car shows, even if it's at 0 doesn't really mean it's dry, there will always still be about a gallon left.
I've seen my range go to 0 several times in a previous generation 3 Series that has a 15.8 gallon tank and the maximum amount of fuel I've ever been able to pump is 14.6 gallons.
Hope this helps.
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