When do I change the spark plugs on my 2011 Avalon?

For a 2011 Toyota Avalon, it's generally recommended to change the spark plugs every 120,000 miles. However, if you notice any signs of engine misfires, decreased fuel efficiency, or rough idling, it may be wise to check and potentially replace them sooner. Always consult your owner's manual for specific maintenance recommendations related to your vehicle.