How much electricity does a Macbook Air use?

I'm moving out and living on my own for the first time. It'll also be the first time I have to pay utility bills. I was wondering how much electricty a Macbook Air (2011) uses during use, sleep, and charging. I'm a college student so I don't have a lot of disposable income so I want to save as much as possible. If I remember correctly, my desktop computer used to shut down every time I opened iTunes when it would work just find when I did other things. Does that mean iTunes uses a lot of energy to operate?
Anyways, I'm wondering if the usage of electricity is high for Macbook Air (2011) and whether I need to charge up my laptop at the nearest starbucks or library.
Thanks in advance.

It uses very little power,  cents/month.  In any case the power adapter is 45watts so the max it could use would be equivelant to leaving a 45w light on all the time.  Reality is much much less.

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