Ok, I know that followers leech XP from your party members. My question is do commanded undead do the same? I have three commanded ghouls following my party of five around and I'm wondering if they're stealing XP that should be going to my main party.
I'll say no: followers not under the direct control of the player, such as undead, charmed NPCs, animal companions etc are not taken into account for XP, afaik.
That's right, unlike NWN where even summoned monsters leech - bastards!! You can confirm XP allocations by toggling the die roll counter after a kill