Great/interesting post as I have been using the Peloton bike and training plan(s). I just write the time (minutes) and watts on paper and read it during a 60-90minute scenic ride. My Peloton FTP has always been lower (10-20watts) compared to outdoor Stages PM on road and gravel bikes. It has been several months since taking FTP test on Peloton (265). I know I’m stronger now (maybe 250ftp?), but I took outdoor FTP test today (314w). Looking to test on Peloton bike soon and see the discrepancy between Peloton (Calculating power) and Stages (measuring power). I have always felt outdoor PM is 20-30 watts higher than Peloton indoor bike.
Also, my Peloton calibration is pretty accurate after I did 3/4 of the calibration test (pedal, 1/4 turn knob, confirm power, 1/4 turn knob, confirm power, etc…).