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I've always adjusted based on the "blind spot" itself. Sit normally and look in the rear view mirror. Take the furthest item you can see on the left, and adjust your driver's side mirror so that you can barely pick that item out on the far right of your side mirror's field. This is visual confirmation that there is overlap, hence no blind spot. And unless your peripheral vision is below average, you should have no problem seeing with your actual eyes anything that is beyond the left field edge of your side mirror, in this position.
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