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I'm confident that octane is not changed significantly.
My Civic has been pinging at low rpms since I bought it. I've been trying to figure out why, but still haven't sorted it out. With low octane gas (87 octane from Costco) it will ping up to about 1900rpm. With high octane gas (91 from Costco) it only pings up to 1700rpm. I've tried several tanks with TC-W3 and several without both with high and low octane gasoline, and there is no change in behavior from the TC-W3 oil, only from what octane rating the gasoline is.
If the TC-W3 oil would affect the octane rating, I would expect a change in how bad my engine pings.
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