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It's not purely cosmetic, so I'd leave it. Downforce at speed is a good thing, if you're thinking about stability. Your wing's shape actually will produce a bit of lift reduction.
It does add a slight degree of drag, but removing it will probably give you (just a guess) maybe a quarter of a mile per gallon extra, but you'll feel a little looser going down the freeway. Not good if you need to swerve to avoid an accident.
If you're going to electric, definitely keep it, because there's no MPGs to worry about.
I'd LOVE to have a car like that.
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