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Why does the laptop battery last longer with Windows than with Debian?

I'm a new Linux user  (currently using Debian 5 testing) and I've noticed that the battery of my laptop used to last much longer with Windows Vista (4 hours)  than with Debian (2.5 hours). How's that possible?I mean, Debian uses much less RAM (250 MB) than Vista (1 GB).

Also, is there anything I can do to improve my laptop battery life?



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