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If you forced me to bet, I'd say it that spoiler is a help.
The car has a pretty short rear decklid. The spoiler's added height may help with flow reattachment.
Also, from what I've read & seen, a rounded trailing edge at the back of the decklid isn't good for aero. The spoiler fixes that problem too.
That said, the difficulty is in proving it (may not be a big enough change to detect in on-road testing). But if it were my car, I think I would leave it on.
It's a tough call for an amateur like myself!
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