Doesn't really seem possible to me, 136k xp/h would assume that you were holding XP rates close to that for a majority of the time spent online. While skills like Runecrafting cap out at around 60k xp/h at those levels and around 25k xp/h for mining, with thieving, agility, woodcutting and hunter close to that, it seems unrealistic that you could of held such a high rate of XP gain throughout the lower levels. In comparison, I've been using highly efficient training techniques (waterfiends, etc) but still max out at 50k-60k xp/h average.