Quote:
Originally Posted by Piotrsko
Not sure if there's enough drag difference to measure unless they like totally mess up the side flow. 1% improvement or degradation gets lost n the data signal
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https://metrompg.com/posts/mirrors.htm
The paper referenced there claims 3-6% as a result of mirror drag, so remove both mirrors and you will get 3-6% lower total drag.
If you are looking for 2% for a mod to be worthwhile and your mirrors are 3% of total drag, that means that you need a mirror that has one third the CdA of the baseline mirror.
Testing mirrors on a car is virtually impossible. Unless the car is very low drag to begin with.