I just looked in the new popular science and it had a few short articles on aerodynamic mods. I was disappointed there was no AeroCivic though.
Also ecomodder.com was thanked for helping with the article.
The first was on "The Aerocycle" AKA
this.
The second was how somone added a wedge-shaped aero nose to their 1989 Honda CRX HF boosting their MPG from 40 to 60.
The third was a kammback/mini boat tail on a Toyota Previa which increased the MPG from 20 to 36.
The fourth was Phil Knox's "wonder trailer" which has no negative effect on his MPG when towing it.