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I heard (sorry, no link) that powering it down and powering it up uses some energy in the process - for instance, a PC shifts into high gear for a moment to save stuff and do whatever it has to do to power down. Same with starting up - the processor (whether a kindle or PC) has do a bunch of stuff to get started. This uses up more power than sleep mode will use for a couple days (I heard).
It makes sense. It's like when they say to leave you car running if you will be stopped for 1 minute or less (or whatever the recommendation is), for instance when jumping out of your car to check your mailbox because starting it up uses more gas than leaving it running for a short time.
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