Oil changes

So I’ve been needing to put in 11 quarts when I do my changes. Is it because I get more out by sucking it up threw the dip stick hole vs draining through the plug on the bottom?
I ask because every kit out there for this motor only sells 10 quarts.

Just did my first oil change (S6 V10 5.2 late 2006) well in fact small service/inspection (all filters and oil).
I raised the front in my driveway and drained using the drain plug.
Was a bit surprised that I had to fill it with 12 liter before the level was right between min/max on the stick??!?! (car level on ground)
Thought it only took 10 liter?
Also the bolt/plug was mounted with a copper chim but the new plug I bought was without??
Can anyone enlighten me?

EDIT: 12 liter is 12.68 quorts