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How long are your rides? If they are like mine, less than 10 miles or so both ways, they may not be getting hot enough to turn blue. This doesn't mean that there is a problem.
That being said, high octane acts a flame retardant. So, you may not be getting as hot of an explosion as you might if you were using 87. What is your fuel economy like? I'd bet that you get better mileage out of a tank of 87.
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