MacBook Pro Boot Camp Battery Issue

Hi all, I have just installed Vista on my MacBook Pro late 2008 via BootCamp. The thing is that I have very low battery life under Vista (1hr 50mins at 100% battery). Other than that, when I choose "Restart in Mac OS X" in the Boot Camp Utility on Vista, on Mac OS X I have no more than 4 hours battery life. When I shut down and start the MBP with Mac OS X again I now have 5 hours 20 mins battery life marked. I think this is a firmware issue, some hardware resources are not released by Vista or something of the sort? Am I the only one with this problem?

Since Windows uses the 9600M GT the power-draw (wattage) on the battery is alot higher. But even when both OS X and Windows use the same graphic OS X draws less minimum wattage.
XP is a special problem, because the NVidia drivers seem to have a bug that keeps them from clocking down the graphic-card in 2D and make the GPU run at full speed all the time. This does not happen on Vista though.

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