Update, Part II up.
The Aero-Vios Experiment (Part 2): Did our hard work pay off? | TopGear.com.ph
So, results... 5.3% difference. But the testing was very sketchy... admittedly, so we'll be trying to do another run. Hopefully with enough budget for wheel covers and an airdam.
Still... cost calculations, ROI in less than 7,500 miles.
(excluding uh... wear and tear...)