Lowering the car reduces frontal area and cleans up underbody airflow, which helps efficiency. In a comprehensive aerodynamic study on the closely related Model 3, the Moderate 1.5 inch drop produced an 8.1 percent reduction in total vehicle drag and lowered the drag coefficient by 0.019 from a 28.5 inch baseline. We expect similar behavior on the Model Y and will publish that data once the analysis is complete.
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