This is a great question, and one I've been asking myself lately WRT the Paseo. Now, the Paseo's spoiler doesn't look like much. There is barely a gap between the trunk and the bottom of the spoiler (less than an inch). This leads me to believe it may help with aero. Also, I have noticed that on a rainy day the back windshield stays
completely dry at highway speeds. I believe this is a good thing? None of my other cars stay as dry as the Paseo in rain. So, is it possible that the spoiler helps this (since it is downstream of the airflow)? I think I speak for most here in saying I don't want to rip off the spoiler (a big PITA from what I've heard) just to see that it does in fact help aero.
