On the OG Civic Hybrid, that tiny spoiler on the rear of the trunk lid is part of the aerodynamics package that resulted in it having a 0.03 lower Cd than the non-hybrid model (0.28 vs 0.31 IIRC). Of course, there was more in that, like the more closed off upper grill, additional underbody plastic, and more aero (though not particularly???) wheels.
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