A lot things can drain the battery..without more info no one can tell you really anything...try grabbing an app so you can see what is draining what...you say the phone was mostly idling ...well when it wasn't idling...depends how long the display was on..what you were running and doing etc...bad reception in areas can even put a damper on the battery...but anyhow...For 1 of us to help you we need more info than someone just popping in saying "who else is having terrible battery life with this ROM" and not listing actual evidence for us to see what's going on.
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Will recharge my phone and post a GSAM battery after a use cycle.