Unplug if not using for several days?

If I am going out of town for several days, I always turn off my mac. Would it be a good idea to unplug it too? I never have before, but I was thinking today that that tangle of wires plugged into the surge protector seems like a waste of energy.
Advice appreciated.
Thanks very much in advance.

Thank you all so much for your advice. Sorry to be so long in saying 'thanks', I was out of town. I decided against unplugging the computer. The storm chances are fairly low, and it would be awful to run down the memory battery, as the closest Apple store is over an hour away in Austin. Thank you all again for your help.
Regards,
Jane

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