Improving the under-car aerodynamics, Sedan.

[gclark8]

Has anyone given any thought to Improving the under-car aerodynamics, particularly in the Sedan?

As a former Citroen owner i am used to seeing a smooth bottom under a car.

Having just bought a Sedan, I noticed the big gap between the spare wheel well and the rear skirt. Has anyone considered filling that space with a sheet of plastic or cardboard to see the difference?

If successful, maybe someone could fabricate fiberglass panel to do the job.