I'm trying to determine power consumption of my project. It's a fairly straightforward circuit to download data over a serial interface, process it, and save it to an SD card. I'm using a Teensy 2.0 with the pjrc.com microSD adapter. Unfortunately, it's going to be a few weeks until I can test it in action. On the bench, I can power everything up and initialize the SD card, and measure the power consumption while I do that (~55 mA at 5v). Will actually writing to the SD card make a significant difference, or can I be reasonably confident in that figure?