In comparison, no it does not matter. Each one has dozens of options you can change, and services can be disabled as well. Hardware has an effect as well, and one power-hungry machine could run either OS, thereby skewing the result for a given OS.
I run vista on my 17in laptop and get a full 4 hours of battery. If I mess with the power settings (even trying a "lower power" setting) I get less. Counter-intuitive, I know. It's just options that have to be tweaked. BTW my current settings run aero and several other programs, including a fan control program that keeps my dell fan at full blast.
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We contend that for a nation to try to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle.
-Winston Churchill
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