If you go to this page:

http://www.kemcooil.com/product_info.php?pId=61

and scroll to the bottom, you'll see that it's sold for offroad use only. The also sell racing fuel and racing grade methyl alcohol.
Now, if you have an older, hi-compression engined classic car that you like to flog around the local road course, it might help you to keep from destroying the pistons crowns from detonation.