Keep the mirrors. They're not your "big fish" in terms of aero and you really ought to have as much easy visibility as possible in the early years of learning traffic patterns. Instead: airdam, undertray, grill block, or wheel skirts. Those are each better for aero it seems from the results people usually describe. And I have been much happier with those changes than with the passenger side mirror delete.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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