I am not sure you could safely do it on a PVP sever but think it likely you would get much more tagging out of group outdoors (though we would have to see actual numbers to be able to fully confirm).
You also could maybe get more if you were running an instance with a single 60 Tank boosting 4 lower level alts instead of 4 60s boosting a single lower level alt. (edit: or a 60 Mage Blizzard-Kiting mobs for 4 boostees).
Note that in Pertrolsk's case he isn't running it for XP but rather is running it for a Best in Slot (BiS) drop for his future 59 Twink (who may do 40-49 BGs for a bit).
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