More energy efficient: USB or Bluetooth mouse?

I have a great, very small Kensington USB mouse that I use with my MacBook Pro all the time. But the cord does get in the way, especially when working on a small coffee shop table, and I'm thinking about switching to a wireless Bluetooth mouse.
Which, however, do you think uses less energy (and therefore offers longer run time on the MBP's battery)?
For what it's worth, System Profiler reports that my USB mouse uses 100mA.

Hi Scott
system profiler never seems to report bluetooth power usage under the usb section, nor could I see any reliable change when flipping BT on/off... but based on figures for BT adaptors, I guess you'll find it much the same, when receiving only, which presumably(?) would be much of the time.

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