Something to keep in mind when comparing battery life, you'll need to go through a few cycles of charging and running it out before the ROM "settles." I'd give it a try when you have a solid 2-3 days minimum to see how the ROM really runs.
Also, you can change settings on your phone that will help slow down the way it seems to eat through the battery.
Turn off Auto-Brightness and set it low whenever possible. If there's glare or you're outside you'll need to turn it up, but more often than not you can get away with setting it around 20% or so.
Also, use Wi-Fi and turn off the Mobile Network if you have the option to during the day. You'll still receive calls and texts, so it's great if you have Wi-Fi at work.
If you are a heavy widget user, that's eating battery too. Turn the settings to update at the longest possible interval or only when opening the app (manual).
Make sure SetCPU is running properly so when you're not doing anything with the phone (ie- screen off) it's draining as little power as possible.
Do these things and use a stable ROM and you should notice a HUGE difference in battery life!