Jinn

Marginally. Vista is more GPU and CPU intensive, particularly with Aero enabled, drawing more power. I don't think I've seen any good comparisons on battery life, but I wouldn't expect more than a 10% increase in life. On a 2 hour battery, that'd be about 12 minutes.

You could try enabling some of the power save modes and lowering the brightness of the LCD, as well.

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