[smsm42]

>>> This is important because no one ever pours themselves 80 ml of wine.

Well, this is not completely correct - in wine tastings, for example, the recommended pouring usually is about 2 oz which is under 80 ml. Of course, tasting just once is another question that gets us back to the square one...

[DanBC]

You make an excellent point.

A wine tasting portion is a sip, that you slurp up and then spit out. No-one (I imagine) thinks of that portion as a real serving size!

[smsm42]

I never spit out when tasting wine, that seems pointless to me :) Then again, I'm not a professional or even in any manner advanced taster, I just do it for fun.

[7s]

Why would you do that, I never even heard of this before.