I'm interested in your observation as I am looking for an nvme drive for a MBA.
Which MBPr, adapter, and driver is being used?
Thanks.
MBPr early 2015 13" 2.7/8GB
Kingston KC1000 480GB and Sintech adapter
It might be purely subjective since I've only seen the huge red battery logo maybe twice in the last two years, and since upgrading to HS already had it fully drained several times. But it may just be High Sierra's fault, many people reported higher temps and I see it too e.g. watching HTML5 video(CPU goes to 85*C sometimes), that would mean worse power saving.
Right now with only Wi-Fi, Safari, screen at low brightness I'm getting 1:06h left at 15% from Activity Monitor, that would mean 7 hours on full charge which is quite bad considering it lasted about 10 when new. I don't think the battery's dying also since it only has 200 cycles.