Buy the 10% XP heirloom items.

68-75 Normal UK. Clear the hallway up to the furnace in one pull. Clear the furnace room in second pull. Clear the drake room third pull. Run up to the boss room, pull the 4 mobs there back to the first 3 just past the drake room and kill them there. Reset. 10 minutes max per run.

75-80 HoL. Kill the general and clear all the mobs on pathway he patrols around, then reset. Since theyre in manageable camps, you can pull as many as you feel comfortable with. If you're leveling healers, you can clear faster. I was able to clear the whole pathway in 3 pulls leveling my druids with my paladin. Roughly 15 minutes per run.

At minimum level for the instance it starts out around 120,000-160,000 per run, scaling down to around 80,000-100,000 per run when your lowbies start to outlevel the mobs. I doubt you will see a reliable average of 100k per 15 minutes in AV or questing.