Which way to tether uses less battery? Wifi or BT?

I'm not worried about range or number of devices. I'm going to be on a trip, and want to be able to use my wifi iPad occasionally for the larger screen. I know that either option is going to have a negative effect on battery performance, but, I am wondering if anyone has done any testing to see which option uses less juice on the iPhone 4?
Thanks in advance,
Dimwit

not sure but BT always made a big deal about using less Watt then wifi

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