Myth or Truth, iMac uses less power in Standby than when off

I'm sure I read this somewhere on the internet.
I'm not sure what model it was for, but I heard that the imac uses less power when in sleep than being shutdown (when still plugged into the wall)
Can anyone confirm or denigh this?
Ifs it true any web links to this?

If it's powered off, it's using no power at all.
I suspect this is about the power cost of waking from standby versus pwoering up from off, and whether it makes more sense to leave your Mac in standby when out of use or whether to swticth off completely.
It depends on your usage pattern. If you leave the Mac unused for very long periods of time, it makes sense to power off, because standby uses a little power constantly. If you leave it unused for shortter periods, you probably use less power in standby.
Unfortunately, I don't have a magic number for the time period
As a rule of thumb, I'd say if it's unused for less than a day or so, standby makes more sense. There's a discussion at the link below which also fails to give a definitive answer but has some interetsing comments.
http://apple.stackexchange.com/questions/7588/for-least-power-usage-should-i-tur n-off-or-put-my-mac-to-sleep

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Myth or Truth, iMac uses less power in Standby than when off

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