<human>: What should I do to make my car more fuel-efficient?
<bot>: To make your car more fuel efficient, you can reduce the amount of time that it spends idling by turning off the engine when not in use. You could also consider using a lower gear and reducing the vehicle's speed while driving. Additionally, try to keep your vehicle maintained properly so that it is running at peak performance. Lastly, be sure to check for any air leaks or other problems that may cause your car to lose efficiency.