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Blue2003SS

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  1. I have been using the middle octane (89) for years and my SSS would always knock at cold or hot start-up. It has been doing this from the first day I rolled it off the lot. I have had the knock sensors replaced a few times under warranty and Chevy basically told me to live with it. Then I started to use Chevrons Supreme 91 and the start-up knocking is gone "or my hearing". I never noticed pinging under hard acceleration with the 89 but I noticed a slight increase in fuel millage with the higher octane if I keep my foot out of it "doesn't happen to often."

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