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I went with my lower 80 team (pal-4xshammy) with about a 3500 gearscore average to Hyjal and just quested for four hours with tons of waiting, and I mean tons.
With no BOA gear on I got about 70% into 80 before giving it a rest and starting my all Worgen mixed team which I got to level ten in about an hour of questing.
In beta it was much faster leveling a single toon but I'd rather my toons stay the same level.
Lots of green quest rewards were huge upgrades for my lowbie level 80 team. I have yet to take my 5500 average gearscore mixed team to the expansion.
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I was getting about 700k / hr unrested XP gains in BRC. I love that instance. You can really rip through it.
Only challenge is the second boss. But, if you have the DPS for it, she just falls over. After that, it's a piece of cake.
Stonecore is a whole other story. I gave up on it after the second boss when I saw the trash to the third. I'll get it figured out here eventually. The first boss is pretty easy, it looks like a mess at first, but there's a neat little area just to the right of the worm as you're looking at it where you can park your team and they won't get hit by the underground ability.
I hit 83 finishing the quests in Deepholme, and ripped to Uldum. Hit about 600k / hr just questing out there, and should have 84 here in an hour or so, and then it's off to Twilight Highlands.
Now - the major pain in the ass in Uldum is the gathering quests in the underground temple area. They're a nightmare. Absolute nightmare. I'm not sure if you can avoid them though, since they are the gate to the rest of the Harrison Jones questline.