Well, I thought it might be nice to get a good aerodynamic comparison going between different cars and CdA is really the only way to get that. So, this morning I threw some data together on an excel spreadsheet and totaled up some of Toyota's smaller cars on it. I'd like to expand it to other brands (I'm most familiar with Toyota) and I would like you guy's help for that. Here is what I have so far.
You can see I sorted it by CdA. The height and width are in inches and frontal are is in square feet (W * H * .81). The formula used for CdA is Frontal Area * Cd.
EDIT: The list has been moved to the EcoModder Wiki pages.
Vehicle Coefficient of Drag List - EcoModder