How far to solo without fungi?

[Flamewraith]

Hey all, I decided to roll a rogue and fucking love it. He has ragebringer and about 45k in gear, but no fungi. So far I'm tearing blues apart pretty easily at 24 in the OT and I was just wondering how much longer I can expect to successfully level faster solo than grouped. So far soloing is about 3x faster than grouping, but I'm sure there will be some steep drop off point where mobs just hit too hard to solo efficiently without fungi and I'm wondering when that is. Thanks all.