This is the method the power levelers have used since closed beta and I finally got one of them to give it up. It is by
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Pretty cool that with the 50% more xp you can go from 1 to 60 in ~ 16 hours. : r/wow
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Diagram of the average time needed each lvl untill lvl 60 : r/classicwow
WoW Classic Fury Warrior Leveling Guide 1-60 - WoW Classic - Icy Veins