Macbook Air Ethernet USB Adapter an Energy Hog??

Hey to all,
Recently picked up a MBA and am very happy with it. The only problem I've had is if I connect the USB Ethernet adapter (to get wireline ethernet at a few places where there is no wireless) my battery times are DRAMATICALLY reduced (by like 40%). Does this make any sense?? This happens even despite relatively light Internet surfing (checking email, etc.) I would have expected that hooking up the USB Superdrive (which is powered by the USB port) would have a big effect but the USB Ethernet adapter?
Is the USB port an energy hog? Any techies can explain this in layman's terms?
Thanks,
JLC

I don't have one but I'm not surprised. The ethernet will need to be powered whether there is an traffic going over it or not. So I don't think whether you are light browsing or transfering GBs of data that it matters much as far as powering the port is concerned.
I would suspect the Superdrive is a significantly larger power hog, but I would expect a reasonable amount of power loss by using the ethernet adaptor. 40% is higher than I would have expected but it doesn't seem like a huge surprise.

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