That's a low number and not something I'd be looking into.
https://www.notebookcheck.net/Lenovo-ThinkPad-X1-Yoga-2017-Core-i7-OLED-Convertible-Review.226116.0.html shows idle power consumption to be 7 or so Watts so this agrees with your report. That is, nothing looks wrong here.
Battery runtime on the review goes from 2 to 13 hours depending on use.
As it stands I think you are wishing for more battery time than what this design will deliver.
I am using windows 10 pro 64 bit laptop (Thinkpad X1 yoga).
My laptop charge is draining fast and when I ran the sleep study report using powercfg command, i found and "Unknown [None]" app id consumes lot of power (https://ibb.co/nHuZ9v ). Not sure how to identify which services (background) causes this problem.
Any help would be really helpful.
Thanks in advance.