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Garmin’s auto calculator is way out for all metrics for me. I tried to read about how they do the calculations but it’s a bit opaque and I got bored.
For cycling garmin estimates something like 30 W under a ramp test, but it’s dealing with incomplete data since not all my bikes have power meters.
For running (for which garmin has complete data with chest strap) garmin spent all year telling me my threshold pace was 4:30/km despite giving me a predicted marathon time of 2:45 and me having run an actual marathon in 3:03.
I have very little confidence in their numbers.
ewanmac
I've just done the FTP Test (shorter) on Zwift and have a 44 watt difference between what's Zwifts telling me and the Garmin FTP detector (Garmin is higher). That's a pretty big difference....anyone had experience of this and which one should I be going on? Should say this is the first time I've done an indoor test and had used the Garmin detector thing prior to this.