Yeah that's pretty low, though keep in mind that it's relative to a balanced split (16.7% for 6 people), so if your party was full, you were getting ~60% of what you would in balanced group.
Sometimes it can work out, if your particular group is plowing through mobs.
I also thought about adding a built-in look-up of the zone experience modifier, but the wiki page isn't too bad to use.
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