The rear wheel skirts "test" I ran on my car was kind of sloppy: first of all, it wasn't an A-B-A. The skirts were added on top of another significant variable (grille block), so they weren't tested independently. (That made it actually an A-B-BC test.)
Out of curiousity I'm going to re-run the test. I'll be using a different car this time as well: 2007 Toyota Corolla automatic.
sweet metro, your test will let me know if its worth paying for that rear wheel skirts again, i've lost mine in on the highway! was so pissed! i SHOULD have velcoed them instead of using painter's tape X_X
If your reading this, then good for you, your saving some gas because your here.