Is there a system for figuring out xp for many easy enemies other than just adding up the xp for many low CR encounters?
I ask because in tonight's session our party of 4 PC's at level 5 managed to defeat an army of 40 gnolls with a well placed fireball and a castings of glitterdust. All in all it was a rather easy fight, but doing the math for 40 CR1 opponents it looks like each of us took home 4000 xp each, the same amount we would have received from a CR11 encounter. This seems odd since the encounter was much easier than a CR11.