Sven,
I have no idea. I was used about half of it trying to find the best way to fit it, initially I cut a slice down the middle, which worked but slide right off. But I was able to seal up the majority of large gaps.
I am working to increase my Cd as I have hit my limit at about 49mpg on the highway +/-. So I am hoping this among other changes will help. Slowly but surely
-Dave