I run primarily dungeon teams. In 6.0.2 I've been finding that trash leading up to a boss plus the boss is 5%-6%. I had been doing just monkey runs previously, but I'm not getting the same percentage post-patch (typically 3% without the boss now).

Personally I enjoy dungeons more than grinding mobs or questing, and what I've found to make the REAL difference in leveling is to do the thing that is least objectionable to you. I'm leveling this last (5th) 5-man team to flesh out some roster changes on my primary teams before the expansion, and I just want to be through it, but doing something I enjoy rather than something I find onerous has made the leveling pass more quickly for me.

Since this is my first post I wanted to add that I have very much enjoyed reading the forums here as a resource for multi-boxing over the past year, and I look forward to joining your community as a more active participant!