i found it way faster to quest after 40 if your doing the RAF. if you have a high level to run you then just quest and have him kill everything. there will be an xp nerf with him i the group but if you can 4-5 quests in 20 mins the quest xp will makeup for it (takes like 4 quest turn ins to level) , when i was doing my shamans i had a them follow my 70 around and went from 40-55 in about 6 hours going from ferealas-tanaris-felwood-winterspring then boosting them to 60 from 55 in ramps