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It was reported that power consumption raised significantly with 2.6.38.x kernels: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/760131 I can't confirm this bug but it is mentioned in launchpad that this is upstream bug so it may affect on Fedora 15 kernel.
Please provide data in the form of power metrics with both F14 and F15 kernels. (F14 userspace for both is probably best so as to minimize component variation.)
Please reopen if shown to affect Fedora.
I don't have installed Fedora 15. Hope that someone running F15 can do this.