From the graph the screen was never on for an extended period, and looks to cover about 20-25% of the allotted time which would be 3-4 hours (I'd love to know the exact number). Either way, screen time is a little on the high side when comparing to my experience on stock. I've heard good things about that kernel and rom, its one im highly considering...
plus wifi really make a huge difference... that is probably a key factor in the life above too...
I get about 2.5 hours screen time from 100% to 0% on stock and fully 4G. That's the main battery drain, and the most important measure of battery life in my opinion.