A couple of nights ago on CM7 my phone went from 54% battery when I went to bed to dead in about 7 hours (I didn't do anything on my phone at all because I was sleeping
).
Last night (same scenario as before, but with Imoseyon tweaks installed) my phone went from 96% to 83% in that same time span.
I don't know if the Imoseyon tweaks did the trick or because I rebooted my phone a few times during the day due to other things (BWC) I was playing with.