Small blind spot mirror - I've been using this for the past several years with no issues. Definitely less drag than the massive stock mirrors, and the convex shape of the mirror + panoramic interior rear view mirror basically eliminate all blind spots. Passenger side mirror is completely deleted.
Link to picture of my setup:
https://ecomodder.com/forum/showthre...tml#post587745
Whether or not it has less drag than something like
this remains to be seen. Some state inspections require the side mirror to be adjustable, in which case the motorcycle mirror would be necessary.