Well, it's not universal... I'm seeing the same battery performance between WM5 & 6, with basically the same setup of apps/today items running on both.
What might be true is that the HTC Home, or some other thing being used in WM6, or some default registry settings (see above) in Wm6 vs Wm5, are causing the drain. But I don't thing the OS itself uses more (or less) battery.
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