I decided to measure power consumption for fed devices @ 5V (USB). Here are the results:

Name Ah @ 5V
iPad Mini Retina 0.95
iPad Mini Screen off 0.45
iPhone 6 1.00
Kindle Paperwhite 3 0.25
Arduino Micro + 128x64 OLED + 10DOF IMU 0.05
Arduino Micro + 128x64 OLED + 10DOF IMU + GPS 0.07
RaspberryPi 0.45
RaspberryPi + 7” Touch screen 0.90

Do you have any more data to contribute?