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I'm curious:
What grade of gasoline do you guys use in your Insights? I've tried every grade there is, including ethanol-free, but never saw any measurable gains with any of them, so I stick to 87 octane now. Car runs fine on it, but I'd like to know if anybody has had any better results using another grade. Maybe I didn't give the other grades enough of a chance.
KFM says the owner's manual suggests 91 octane? Guess I could have read through the manual at some point, lol!
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