I use the right side mirror ALL THE TIME, the 240 doesn't have one and I'm on the hunt for one. Its so easy for a motorcycle (or even a miata) to hide in your blind spot. My old GF didn't use her right side mirror and turned around every time she changed lanes to the right. It made mecringe every time and once she almost ran over a tire in the road because she had to look behind her for a second. I'd pick something less functional to remove...which, refreshingly, there's not much of on these cars.

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1985 300TD-euro 352,000 mi
1974 240D (1?)52,000 mi - has a new home now