I have a factual question about my new P1 pedals.

- When I zero offset (i.e. "calibrate" on my Garmin) before each ride, the offset is always 8, 10, or 12. My question is, if I don't zero offset before a given ride, do my pedals stick with the last offset I did, or is there no offsetting at all, i.e. will my power numbers for that ride be off by 8-12 watts (I'm assuming watts are the offset units)?

- Relatedly, since the offset presumably changes a little during the ride as the temperature fluctuates, given how narrow the offset value range I'm getting is, how important is it to to zero offset before each ride?

Thanks!


EDIT: I guess offset is measured in Newton meters, I suppose watts is a unit of force over time whereas a Newton-meter is just instantaneous force. High school physics was a long, long time ago...