the hybrid has bigger side mirrors, and it also looks like it has a lower front lip. The external antenna on the hybrid probly does act like a vortex generator, however ther's only one adn it wouldn't have a huge impact on the cars aero.
as far as that deck spoiler... id rather see something that extends back from the top of the trunk than that little lip for aero. airflow's probly turbulent at that point anyway, the spoiler would probly just increase drag.
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