Wow.
I just read the article, and also the "part 2" article referenced in part 1.
Part 2 is at
http://autospeed.com.au/cms/A_2456/article.html
Part 2 takes us away from the cooling system drag question and deals with undertray design, construction, and benefits. Well worth reading. And their experience closely follows my own, though with a very different car.
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Check your tire pressure - keep it up !!
We've learned that diet has a closer relationship to cancer than we ever thought. Please see this Wikipedia article on
The China Study.
Driving Lean Burn '97 Civic HX, lotsa mods by now! '89 Volvo 240 is semi-retired. I did love that car though!