Efficiency of grinding?

[Augris]

So when I used to play vanilla as retail, I would always quest to level. I have heard some say, though, that grinding is actually faster. Is that so? And what about leveling with a partner: would it be more time-efficient to grind up and do some instances once in a while, or to quest with said partner? Or would it even be best to grind up through instances (provided that you could consistently find groups)?

[Kogmawn]

Maybe if you're rested, but you can't continually do it.

[Augris]

Maybe if you're rested, but you can't continually do it.

Grind, or grind with a partner?

[Slibzshady]

u can aoe grind as mage, 3 levels a day no matter what level u at..
.. u just gotta find the spots the xiaos arent at :D:D::DD