Geonids in WL, bear pits in permafrost, top of City of Mist, imps and efreeti in Sol B, raptors in Timorous Deep, basically everything in Skyshrine, Nez/Phurz camp in Burning Woods, the entrance --> exit loop in Chardok

I tend to think the Wiki values are pretty close. I have a spreadsheet from around here that I stole from someone, maybe even you put it together, who knows, but you can put in ZEM, Race bonus/penalty and level of mobs (average) you are killing, it's almost spot on. My main example was doing Bloodgills in LOIO for 1 whole level in one sitting, it was like within 9 mobs of being exactly the number I needed.

I don't take them as the XP bible or anything but they seem very accurate at least as a comparison. Like.... The Hole is definitely better than most of the Kunark 85 ZEM dungeons, just killing 10 mobs here and there. That being said -- we don't really use it as an 100% we go somewhere, we kill for 1 hour, see our % per hour and if it sucks we do something else.

I'll echo some spots that people here have mentioned:

SolB efreeti trash
Hole castle ent or docks
HS basement, north, or west
Skyfire named cycle
Chardok ent
CoM 2nd/3rd floor

Yeah, exactly how accurate the wiki ZEMs are is hard to say. Personally I'd say they're close enough to being accurate to be worth including in the guide, but far enough from accurate to be worth warning people about :)

I'd love to see your spreadsheet if you can share it with me somehow though, as it might help us narrow down ZEMs without the super-painful process I described (ie. killing a hundred or so mobs of the exact same level in at least three zones, and then doing some math).

I'd keep it simple. Karnor on off peak times and Howling Stones during crowded times.

Sebilis ng camp when you get 55+. Grab an undead pet at crypt door and go to work.

Like others have said, efficiency-wise, HS basement is your best bet. Once you're 54 and get your class-defining end-game spells (deflux / thrall of bones / shield of the magi / shadowbond), you two should be good to go into HS North and poke around.

This.