So I recently found out that you could xp tag and actually get ~70-100k xp an hour from lvl ~45ish to 60. Thought i'd share it here =)

[Iudex-arathor]

You get full xp on your alt if the mob is green for the lvl 60 character (so 48 or higher), if its grey for them, then you get xp proportionate to the damage you deal to them (so for example a 47 mob is worth 250 xp, you deal 90% of its hp in damage to in on your main and 10% on your alt, you get 25xp). On topic, its a very good way to level your alts IF they are on a second account and you are 48+ and your main is dps. On lower levels its better to have a healer to boost yourself, preferably a druid because thorns is op on low lvls and doesnt steal xp.

[Anonymouse-chamber-of-aspects]

@Iudex-arathor

You get full xp on your alt if the mob is green for the lvl 60 character (so 48 or higher), if its grey for them, then you get xp proportionate to the damage you deal to them (so for example a 47 mob is worth 250 xp, you deal 90% of its hp in damage to in on your main and 10% on your alt, you get 25xp). On topic, its a very good way to level your alts IF they are on a second account and you are 48+ and your main is dps. On lower levels its better to have a healer to boost yourself, preferably a druid because thorns is op on low lvls and doesnt steal xp.

THIS is true !
I tested again to be sure, in NO way this works for characters under that level. You only get a tiny fraction of the XP.