Earlier quoted context omitted.
Interesting on the battery lifetime. My ThinkPad Carbon X1 gen 6 can do 10-12 hrs in Ubuntu, though I had to switch the bios sleep mode to Linux. Maybe the lack of an Nvidia graphics card helps.
Could you go into more detail about this?
Currently I have 11 hours remaining, on 78% battery charge with a fairly dim screen (I use a setting to prevent the battery charging fully to extend its lifetime). Powertop shows a draw of 4.1W. Strangely the computer seems to run hotter in Windows and the battery lifetime is a bit shorter.
I'm using Ubuntu 18.04, running KDE. The laptop (Carbon X1 6th Gen) has a very nice keyboard, red trackpoint, 1TB NVMe SSD, 16GB RAM, i7-8550U CPU and a 2560x1440 display. It also has USB-C plus a couple of USB-A and HDMI sockets.