in some cases, yes. Ie. with a corvette, which has a swoopy roof, it is better to have the roof to keep smooth airflow going to the rear wing. However, with a short roof like on a miata, if you chopped off the windshield, filled in the side, etc, you would cut down on frontal area, which could help reduce drag.
Also, open-top would reduce weight too...
Also, open-top would reduce weight too...
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