(linux + KDE) i save 24% by using black (#000000) everything, backgrounds, full theme, contrast control setting in firefox etc. on notebook with OLED screen. also if possible not using Chromes / safaris youtube video player but downloading of a video makes huge energy savings. (and using MPV in linux or properly configured PotPlayer in windows. VLC or default MS video apps are bad at energy saving.)

And we are talking about 15+ hours of actual office work in webbrowser + little bit of python math. so add 24% on top of that... that is literally weekend worth of work on one charge. current generation of laptop CPUS is insane.