The Garmin measures distance by armswing. Given that my form on my manual treadmill is a bit different, my Garmin tends to measure shorter than my treadmill. But it appears to be a bias..increasing my treadmill speed (it is a manual sporttech) increases my Garmin speed.
Not that it matters to my body.
Note: I thought about going another mile, but felt it better to not stress the piriformis too much. Keep to 3-5 miles for now and move up when it is ready.
Side note: Rafala, Tracy’s cat.
Life of an old goat 