Octane additives?

Dumping the booster into the tank is a bad idea, since most of it goes right to the bottom. Always mix it with some gas first. I have had real good luck with Lucas 10026 "racing" octane booster, used per their instructions. Now, I only have a 10.5:1 340, but on 93 octane gasohol (the best we have here), it sometimes pings. With the Lucas stuff added, it does not.