Running Ubuntu 18.04.1 LTS on my Dell XPS 13 9343 (2015).
From my experience, Windows would get me around 5-6 hours comfortably, and in comparison Ubuntu seems to top out at 4-5. I've installed TLP already and it seems to have been to its default settings, but I haven't seen any improvements in battery life.
Is it possible that I might've installed Ubuntu in a way that just consumes more battery (I checked/unchecked some BIOS Settings following the instructions when installing) or should I just continue tweaking it using more battery-saving tools (laptop-mode-tools & pm-utils, etc).
Disclaimer: I understand many XPS/Ubuntu posts have been made a while ago, but I'm mainly concerned about the possibility of an error during installation.