It is likely due to the Asus having a setting that scales the processor down. In other words, it isn't operating at the full 1.66GHz (I don't know the specs of either model but the processor speeds will be 1.66GHz for the Atom N280 and N450 processors). I know that the Asus netbooks feature this speed step technology. Technically speaking, the Toshiba should too. However, I know that my HP Mini 311 operates at 1.66GHz the entire time. I have yet to see the processor step down to a lower speed.
Another option is that the Asus uses a more efficient motherboard and/or LCD panel. There are other options aside from processor speed, RAM, and battery capacity that determine the battery life of a netbook.
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