I've just been reading through the datasheets for the ATMEGA16u2, but I didn't see anywhere where it lists the current draw of the chip when it is operating. Didi I miss it, or doesn't the datasheet say that? Does anyone know the current draw of the chip?
Section 27 Typical Characteristics of the data sheet will give you the information you're looking for. It's the TL;DR part. 
Ah, I missed that. So it's about 14mA.
That's sort of surprising actually. The Atmega328p is only 1.5mA. Why is it so much less??
Did you check the datasheet or did you measure yourself? From the datasheet (at 16MHz it will be more)
“Idle” is one of the power-down modes. You only want to look at the “active” part of the table: “typical: 9.2, max 14”
Oh, I missed that! Thanks! So it is actually 9.2mA.
You should calculate for worse case, so 14 mA.
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