Ok, so my car has the timing advanced to 14' and I always have ran nothing other than 87 octane. I know everyone says "just listen for pinging" but I have never heard the sound of pinging in my life so I do not know what I'm listening for. Is this a loud sound that I should definately notice or is it something that I will barely hear? Where exactly does the sound come from? Anyone else ok running 87 with advanced timing? Fill me in with imformation about this, thanks.