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Wow, I'm surprised the Model 3 wheels are that heavy.
As far as aerodynamics, the Tesla wheel covers just close most of the face, which will be beneficial no matter what the rest of the car looks like. However--are the Tesla wheels and tires wider than what you have now? If so, that will change the drag in a number of ways, some beneficial and some not. A larger wheel and tire will take up more volume in the wheel housing, lowering drag. However, it will present slightly more area to the wind and, perhaps more importantly, extend past the wheel strakes if there are any on a Scion tC (I think there are?).
If I were you, and the cost difference were minimal, I would go with the the lighter forged wheels and ziptie some coroplast covers to them. Better aero than the Tesla wheels with less mass.
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