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My dealer tested the fuel in my car to try and determine what is causing the knocking. They claim the Sunoco 93 that the car was filled with tested at 16% ethanol. Supposedly, this high ethanol concentration is causing the car to knock. They told me that I needed to burn that off and fill with Shell 93 and see if the car still knocks. According to my dealer, Shell doesn't use ethanol. This was backed up by the high school dropout that was working the cash register. Not sure if I believe this, but there were no ethanol disclaimers on the pumps like I have seen at other stations in my area.
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