I'm running OMJs custom rom, and MusicFlo in replace of BioTouch (runs in place of original cube). On dotFred task manager, my idle process is 87% of CPU; dotFred TM takes up 11%, biotouch 1%, AEBPlus 0.01% and shell32 up to 0.5%. So when I've got my task manager closed, I'm pretty darn close to CPU usage of 3%.
Note: I've got location and time synching disabled, autoupdate is turned off on my weather page. And yeah, my battery life is pretty darn good, not to brag. Ok, so that was bragging. Sorry