Official press release: DEARBORN, Mich., Aug. 20—Ford Motor Company today unveiled a fiberglass model of an advanced concept car that will be the most aerodynamic driveable car in the world. Donald F. Kopka, vice president - Design, previewed Probe V for journalists at the company's Design Center here and announced that the car's coefficient of drag (Cd) is only .137. That betters the existing record of .15 held by its predecessor, Probe IV, and…