ive also noticed a difference too with 5 boxing or dual. When your in a grp of 5 u might be getting 3 times exp for questing but thats 3 times exp split cause of 5 getting the kill exp. Find out for yourself at lvl 1 5 ina grp gets 50 per kill on a lvl one same as one char doing it right. Well with two you get between 75-100 so right there is a 25-50 exp difference. So you are deff better dual-boxing. Since you will get the same turn in exp as the grp of 5 does but the good thing is you get more per kill as you lvl. Oh on more thing when u hit 59 grant a new char to 25-27 depends if u can get good gear and twink at lvl 29. Since you are only doing 2 you can only grant 29 lvls so who cares about losing a cpl make a easy twink and get the bind on account gear lol.