Garmin has a few versions of garmin developed watchfaces in the store. Here's one:
"Cannondale - Garmin Pro Cycling Team Version 1.1"
https://apps.garmin.com/en-US/apps/fdbe80c5-a732-40c9-a578-5bdadbb12bdc
One of the listed features is:
"- Total miles tally of all the miles you have logged with your watch"
As this is for the cycling team, are these just cycling miles?
Or is it just the miles for all things monitored (24x7 walking, etc) since you've been using the watchface? (Maybe saved right before midnight each day)
It's a bit unclear, but if it's cycling miles, I wonder how they are getting that info..