Erg mode or Not

When doing workouts should you use erg mode or not? What’s the differences between using it and not using it? Thanks

Have a read of this.

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I tend to leave it on for sustained intervals (typically below FTP) and turn it off for above FTP intervals, where I find it slightly easy to hold a power with a bit of fluctuation and gearing (and no spiral of death).

You definitely want it turned off for max efforts or sprints.