ST is much better xp/time than SM for L40 and above, maybe even sooner. Just zone in, take a left up to the dragons. With an 80 tank you can pull all the dragonkin/whelps and kill them in 1 go, takes <5 minutes. Then I go grind dailies or ghost ride the whip for the other 40 minutes I'm locked. It takes 3 sets of 5 runs for 40-45ish with RAF. Normally I just like to push through while leveling but this is fast enough that taking a break is acceptable.