I am super slow, only hit 16 x 5 today (2 pallies, 2 locks (1 demo 1 affli), 1 arcane mage)
(my excuse is I spend more time coding and testing addons... and enjoying AH and professions)

But with my mage getting arcane explosion I basically spam heal the mage while she arcane explodes stuff and that makes quite a nice xp boost on some camps in westfall (the other dps and the tank being sort of useless in that configuration, outside of buffs etc)