<human>:  How do I know if my car needs a tune-up?
<bot>: The best way to know if your car needs a tune-up is to consult your owner's manual, take your car to a trusted mechanic, or check the manufacturer's recommendations for service intervals. Generally, it is recommended to have your car serviced every 10,000 to 20,000 miles or at least once a year, depending on the model and make. In addition, it is important to pay attention to any signs that your car might need a tune-up such as an increase in fuel consumption, a decrease in performance, or strange noises coming from the engine.