I'm running 7/28's nightly flashed on top of RC1 with the snap v3 kernal. My EVO is overclocked to 1.19...
couple of things...first...think it was noted in the nightly build AND the RC1 thread that since the ROM was NOT built from an EVO source...that the battery level indicated MAY NOT be accurate. I'd list the posts...but they are both such monster threads!
secondly, MagnusRagnorak mentioned an app that he uses...and that I tested for me today that worked wonders for battery life...juice defender.
http://forum.xda-developers.com/show...postcount=1507
I'm now using juice defender...and have definitely noticed a difference...I don't have hard stats ie percentage and type of use yet...since i have yet to give it a full day...I am however impressed enough to bring it to the table for all to test