Woah!
I suppose if the car is running well, you shouldn't worry. But I would probably lose to Octane boost. If you are running a low compression engine, such as a B16, you probably can run on pump gas. I suggest you try that for a while and then check the plugs.
In my MGA, I mostly run 110 Octane leaded gasoline. It has a compression ratio of about 10.5 to 1 - not too aggressive but more than the stock engine at 8.8 to 1. I need the higher octane at high rpms. I have a faint red on the threads of the plug, not the tip; and if I remove the head, the combustion chamber looks a bit rusty. I attribute the deposit to fuel additives.
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