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1. An aerodynamic device for increasing a ground vehicle's fuel efficiency, the device comprising:
a wing supported above an occupant roof of a ground vehicle, the width of the wing spanning substantially the width of the occupant roof and further having a topside, an underside, a rounded leading edge and a tapered trailing edge, the thickness of the wing decreasing from the leading edge to the trailing edge; one or more legs supporting the wing, the one or more legs having a top end and a bottom end wherein the top end is secured to the wing and the bottom end is secured to the occupant roof, the one or more legs further having an anterior edge and a posterior edge, wherein the anterior edge is longer from the top end to the bottom end than the posterior edge, such that the rounded leading edge of the wing is vertically higher than the trailing edge of the wing, causing the wing to be angled downward.
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