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Big difference between gym treadmill distance and Garmin Fenix 7 Pro with HRM on

Folks, I did a treadmill run today with my HRM on, and Garmin Fenix 7 Pro...the watch told me I did 5k in 28 mins, but the treadmill said 35 mins....which is likely to be more correct...surely the treadmill can't be that much out if the Garmin is right?