Thanks, more helpful input, and of course a new question!!!

How often should you put in a new plug, or perhaps better to ask how do you know when to put in a new plug. Obviously I don't want the wire going through my engine to be the first sign I notice of plug needing replacement! Are there some general guidelines to follow re plug replacement?

I am using the C6TGC in a Plus-4T with 30% nitro.