Ecomodder forum user basjoos decided to do something because of the gas price runup in the aftermath of Hurricane Katrina. He decided to improve his 92 Civic CX car's gas mileage ... by "aero modding" it!
Basjoos wrote that he spent "Probably about 250 hours and a materials cost of about $400 spread out over the past 2 years. It has paid for itself in fuel savings several times over."
Behold, the Aerocivic! Link