Greens are definitely faster at you level. Take a tortoise; it pretty much 1.5 times better than a T-bird. You might need 2-4 pieces of food, but this is mainly to counteract slight damage from dragon (you might take from 30-50 damage a trip) and from Revenants. Carry your basic Range gear. Don't be afraid to take expensive armor, your grave won't be hard to get to. You may try several spots, although the two I like are East of Clan Wars, because it is fast to bank, or Southeast of the KBD lair in lvl 38 wilderness.(A bit NorthWest of moss giants/skeletons). The latter is always empty, but slightly farther away from a bank. You may need a glory to teleport if using this spot. You can probably get away with iron or bronze bolts, but use broads if you want to speed things up. Don't use anything higher than broads/mithril.