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The user guide for the printer should say.

It doesn't. First place I looked. It talks about turning the printer off and unplugging it if you're going to move it, but nothing about turning it off when not in use.

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Some inkjets don't keep the heads "sealed" when powered-on, and they'll clog much more quickly than when turned off.

Wish I knew if there was a way to find out about that for this specific (canon s820) printer.

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But the more obvious point, is that.. I though the USA was experiencing a bit of an energy crunch these days / years .. ???

I don't think it really uses much energy to speak of when it's not actively printing. Not sure, though.

Most laser printers have a built-in powersaving mode, where they "sleep" if left untouched for a while. The fact that this printer doesn't have that feature makes me think it simply doesn't need that feature.
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Tony Fabris