FC35 with TLP seems pretty decent for idle battery use, but the different forms of suspend do lead to significant drain, especially when compared to the frugal idle power use:
I suspect the figures mentioned there for only USB-C expansion cards are pretty typical for the hardware involved – the drains of the USB-A and HDMI expansion cards look anomalous compared to hardware that comes equipped with these. It would be wonderful if that could be fixed with a firmware update.