Speed Leveling

[Quickburst]

Hi, I wanted to ask if there's someone out there that knows what the most effective way of leveling will be during the MoP launch.
I was thinking of forming a 5 man group and Hardcore level to 90 by grinding dungeons (Full buffs, Speed Potions, no sleep, full beta experience), but is it the fastest way?

If I'm correct leveling in Cataclysm dungeons wasn't that effective as questing (based of a blog that I read from Ensidia leveling during Cataclysm launch). But if questing would be the fastest way it would obviously be an awful experience during launch since the servers are crowded. So in the end I'm thinking the best way to level would be:

- Fast level with core group in dungeons to 87ish?
- Solo quest from there on.

I'm guessing it all depends how much exp/h you get from higher dungeons. I'm hoping there's someone out there that would give feedback on this from Beta experience.

* Ignoring mob tagging.