Running in 64-bit mode

Will running my MBP in 64-bit mode (holding 6 & 4 during boot) give me less battery life on a charge? If so, approximately by how much? I'm considering running my Mac Pro in 64-nit mode permanently but can't decide on my MBP based on this question.
Thanks in advance - Will

CS4 runs perfectly well when booted in 64 bit mode. The program isn't 64 bit of course, but it does run fine.
My Geekbench scores are considerably higher running in 64 bit mode. (4712 vs 4147). With memory performance higher in 64 bit (3196 in 64 bit mode vs 2919 in 32 bit) and memory bandwidth performance of 2050 (64 bit mode) vs 1972 (32 bit mode) and with tests of things Photoshop would be doing (sharpen, blur, compress and decompress image)and memory functions (read/write) all faster in 64 bit mode, it stands to reason that Photoshop is benefitting from booting in 64 bit mode. It's quite difficult to tell if it actually runs faster or not booted in one mode vs the other without a lot of tests, but it sure seems like it's a little faster. Maybe not a significant difference, but it does seem to be.
Lightroom is a 64 bit application. I've never used it in 32 bit mode on this machine, and I can't really say it runs any faster booted in 64 bit mode, but again, with a lot of functionality that it uses running faster it stands to reason it's faster booted in 64 bit mode.
I have no idea about battery life, my iMac doesn't have a battery!
Just donating my $.02 worth

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Attempt to load Oracle client libraries threw BadImageFormatException. This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed.

Hello guys,
            Problem has been solved -
Attempt to load Oracle client libraries threw BadImageFormatException. This problem will occur when running in 64 bit mode with the 32 bit Oracle client components installed.
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Thanks
Chandrashekhar

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http://sqlblog.com/blogs/jorg_klein/archive/2011/06/09/ssis-connect-to-oracle-on-a-64-bit-machine.aspx

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