Spend an hour at different settings / speeds, and graph all the things. That should give you a decently calibrated power curve that you can either plot your efforts against yourself, or you can find a reasonable proxy for on trainerroad / elsewhere.
@NotThamesWater started
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Spend an hour at different settings / speeds, and graph all the things. That should give you a decently calibrated power curve that you can either plot your efforts against yourself, or you can find a reasonable proxy for on trainerroad / elsewhere.