My treadmill and my garmin are completely uncalibrated and the only measurements I have for indoor running are time / HR
I have a video I made of an outdoor 5k at a leisurely pace I put on TV while I ran on the treadmill, and the three displayed the following distances at about 25min:
Video: 3.2km
Treadmill: 2.6km
Garmin: 2.1km
I hate this with all my heart. All I want are metrics that make sense.