[MetroMPG]

So much for not being sloppy:

I should have tested at 95 km/h. I just checked, and that's the speed I used when I did the A-B-BC runs with the Flea and calculated a 2.7% improvement for its rear skirts.

Just based on these averages, the Corolla saw a 0.6% MPG improvement with the skirts alone, and 0.8% improvement with skirts + fairing.