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I can do better than that: Lenovo T61, 2.2 GHz dual-core, 2 GB RAM, in my usual just-editing-code mode runs around 17-20 watts. This is with external keyboard & mouse and the notebook display off, driving a large display that's separately powered.
Of course when I'm running test code (things like seismic tomography) that does serious number-crunching, it goes up to something like 60-80 watts, but that's not at all frequent. But this is a 3 year old system, too.
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