I haven't had to add anything. The meter went from full to the halfway mark during my break in, but it has never asked me to add any. The dealership told me to have a quart in the trunk just in case because during the break in it MAY ask for me to add some, but it hasn't.
I have the service this weekend anyway, so I should be fine.
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel