Does some of it have to do with one removing time when you are stopped? Looks like Strava has 8 minutes more of data than the Garmin.
Hadn't considered that. Do have auto-pause switched on so that's certainly responsible for some of it. Still doesn't explain the small differences in Z4 and Z5 though.
Did you happen to come to a stop just after a hard section?
@Jon. started
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Does some of it have to do with one removing time when you are stopped? Looks like Strava has 8 minutes more of data than the Garmin.