Which gas do you put in 2010 dodge charger 87 89 or 91?

A 2010 Dodge Charger uses regular unleaded gasoline. The octane rating (87, 89, or 91) is not specified by the model year itself. Check your owner's manual; it will clearly state the recommended octane rating for your specific engine. Using a higher octane than recommended won't hurt, but it's a waste of money. Using a lower octane than recommended *could* cause problems.