It would be very easy to measure it if you were curious.
Connected to my router, where I intend to use em,I get 36mA and 60mA for HP 16gig and pny 8gig (both made my pny).. Standby for testing on computer
Edit: same idling on computer... And 60mA and 70mA current while writing to em
Other things I just measured
: My rapoo mouse dongle, while active-35mA (I wonder what a normal mouse consumes) (mouse seems to use single AA at 2-10mA)
Razer deathstalker ultimate-300mA on each of its usb
Xbox controller-idle 20mA,100mW
Chink joystick hotas-idle 11mA,55mW
(Couldn't test while it vibrates, I have no testing software)
Seagate portable hdd,idle-800mW-400mW (startup) 400mA (idle, reading, wiring (operating)) 250mA ejected