Mike Turner's Do-It-Yourself 95 MPG AeroCivic

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fuel efficient mpg diy modified honda civic photo
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Here you can see the starting point, the 1992 Honda Civic CX, with what it became. Notice the wheel covers to reduce drag and air turbulence, and the elongated tear drop shape on the rear end. This is important: We tend to make our cars pointy in front and blunt in the rear, but that's far from optimal.

Photo credit: Mike Turner