I have to agree with @pichlo, and my observations are not just idle flapping but I have definite proof; from June 2015 (when I started measuring) I have logs of the power consumption taken every half an hour. That's over 22000 measurements from my Jolla sbj1.
I also have logged same thing from my Nexus5 and Jolla-C since the day I got them.

Based on real hard evidence I can assure you that there has been no change whatsoever on power consumption of the devices from one SW release to another.