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What is the best octane gas to use in a Chrysler 300?

The best octane gas for a Chrysler 300 depends on the year and engine. The owner's manual is the definitive source. It will specify the recommended octane rating, typically 87 (regular) or 89 (mid-grade), but might allow higher octane as well. Using a higher octane than recommended won't harm the engine (it will just burn the excess fuel unused), but it's a waste of money. Using a lower octane than recommended *can* cause damage over time due to knocking/pinging. Always consult your owner's manual.