I wouldn't think of driving without both mirrors. About the time I "exert energy" to turn my head to change lanes is when the driver in front of me abruptly puts on the brakes and usually to change to the same lane. Besides that there are so many people out there with the very poor , and annoying, driving habit of "camping out" in blind spots. Granted, they are smaller on the MB but it seems they always can find them.

I bet there is considerably more aerodynamic drag from the wheels than that mirror would ever produce.

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Sam

84 300SD 350K+ miles ( Blue Belle )