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The OS does not affect battery performance alone. As mentioned, Vista requires more GPU power for Aero. You can, however, turn off the Aero effects, thus negating that change. It does not increase CPU usage but nominally. Vista DOES offer a greater array of power management, but those are somewhat dependent on your hardware and what ACPI it supports. It might be valid to contact Dell support and get an "official" answer from them.
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The prospect of achieving a peace agreement with the extremist group of MILF is almost impossible...
-- Emmanuel Pinol, Governor of Cotobato
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