I know that the minimum amount of wine to be drunk for havdalah is only a cheekful (m’lo lugmav). But realistically, often the person reciting havdalah will drink the whole--or almost the whole--cup of wine, which is usually larger than the strict definition of a revi'it as 3-3.3 ounces.* So, is a birkas mein shalosh required afterward?
*(See also here for a comment stating that one must actually drink a full r'viis in order to avoid the shaylo in question.)