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self made aero wheels

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Agreed, that having to remove the skirt(s) to change a tire is a hassle, poor weather only makes it more so.
Thats why I mentioned some type of hard PPO style plastic skirts that fastened by quick release clips.
Not attractive admittedly. Something similar in appearance to what you see on 18 wheelers/tractor trailers.
 
Are there any statistics to indicate what spats would do to efficiency on a Tesla?

The Teslas CD is very different than those older cars, so spats may not be the best solution here.
The 2000-2007 Honda Insight had spats, and they made a big difference. ICE/hybrid cars don't come much more efficient than that one.

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