Does the spoiler have any function?
A little bit. It reduces aerodynamic lift in the rear by a small amount at very high speeds. It also reduces drag by a small amount which may have a barely detectable effect in mileage.

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#139640 '07 NA Sly Fully Loaded 12/1/07
#106614 12/15/05 NA Sly Traded @ 35k Miles

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