No real chance of damage.
The only real benifit is if you have a compression that is close with the local high octane gas, and you get knock. Then sometimes an octane "boost" like this stuff can help.
There has been other posts about octane boost before.
If you have knocking with the amount of advance you want to use, then try it. See if it helps. I have 10.5:1 comp, and on the best premium gas I could get (93 octane), I still had a knock at the advance that was best for hp. So I went to Klotz octane boost. About 10 oz for every fill up. It does the job.
It only works if you are close to the limit of your octane vs advance (IMO)
Eric
