I'm not willing to delete the passenger mirror, because that could be a safety issue. I drive in an urban environment, often with heavy traffic. Being able to see into my blind spots is pretty important.
That said, a camera setup might fill the role. But I'm not sure where to put the screen. Also, there's the question of cost-to-benefit. For example, if replacing the mirror with a camera only improves fuel economy by 1%, is the juice really worth the squeeze?
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