Originally Posted by
Brian Ratliff
Not going to pay for the article to see what's what, but there are definitely some limitations to this equation as the ratio between work done by the guy in front to the guy behind clearly depends on speed and wind speed/direction: variables which are not expressed in this equation. Regardless of the math, you can feel yourself "getting on" to a wheel, and it is usually closer than two feet separation and it gets closer as speeds rise.
The correction factor is for resistance not power. Once you're in a crosswind, I agree it's more important to get closer or even overlap. PM me if you want the article. It's mildly interesting if you're a propeller head.