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this is actually been mentioned a couple of times; when in sleep mode , the last page you are on stays in the systems ram, which requires power to maintain, and this is why it's much faster to get back into your book from a sleep state. When the device is off, ram is cleared so no power is required to maintain it. There is however, I believe, constant power drain regardless of the power state for the system clock, but this should be negligible.
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