I agree - this appears to be very sensitive to the polling resolution. If you only run a task for 0.5 seconds, and you only check power usage every 0.25 second

I agree - this appears to be very sensitive to the polling resolution. If you only run a task for 0.5 seconds, and you only check power usage every 0.25 seconds, you'll get an artificially high value. They need to run this for much longer, and with no breaks (moments of low power usage).