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Chevrolet Cobalt LS's are turned for 87 octane, so use 87 Octane, if 87 is unavailable due to elevation or location, go higher, octane is only anti-knock rating, and produces single digit horsepower gain in an untuned car. Don't waste the money, get 87 or 89 if that's all available

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Q: What is the Best Type of Gas to use on a Chevy Cobalt ls?
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