If everyone ran the same apps, had the same accounts with the same amount of updates (emails, facebook messages, etc...), same calls, messages, brightness level, same stuff turned on (nfc, etc..) Then you could somewhat accurately determine what the best setup is. There are too many factors that could affect battery life besides the rom and kernel. Battery life is ymmv. Threads like these sometimes get heated and nothing helpful really ever comes from them.
Keep your brightness down, use better battery stats to check for wakelocks, and Google to hunt down a fix if you have one.
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