Octane Supreme (formerly Lead Supreme)

[mockingbird812]

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That's a good point, Sam...99% of the folks out there have no idea what their *actual* CR is...unless you cc everything you're just guessing. I'd say the vast majority of the engines out there are well below where their owners think they are. And while running too little octane isn't as physically detrimental as running too much, it *will* hurt you performance-wise, and make your car temperature sensitive...been there, done that!

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Rob,
For what its worth, I have receipts from local shop which performed recent engine rebuild including specs on L78 pistons and have decent confidence in what my CR is. I am not sure I understand your comment: "And while running too little octane isn't as physically detrimental as running too much". I thot that running too little may lead to detonation which could be quite damaging to the pistons. I thot there was more room for error on the top end, i.e. too much octane was more of a waste of $ vs. potentially damaging.