Question regarding Aerodisc(s)

[Mache_Nor]

Heya!

Been wondering lately about buying Aerodisc (wheel covers). I've also seen some members on this board that has done it already, thus, a couple of questions.

1) Are there some options where you can buy only the cover and still manage to mount it on the wheel? Or must you buy a rim+cover combo?
2) For those that has changed, what are your range increase / decrease?
3) What are your recommandations of brand / type?

Context: Premium RWD with 18 inch rims.

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[Teslaeata]

I costed a set of these covers for my standard wheels and would’ve cost me about £1,200.

I thought I’d need to be doing something like 100,000 miles per year to make the aerodynamic effect anywhere near cost effective.