rain repellent

Rain-X is a synthetic hydrophobic surface-applied product that causes water to bead up and run off surfaces, most commonly used on glass automobile surfaces. The brand has since been extended to a range of automotive and surface care products, including wiper blades.

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    Rain repellent.

    Presumably the application of a good quality rain repellant should reduce drag and therefore increase battery range. Has anyone come across any tests of this?
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