How can I improve the fuel efficiency of my Toyota Yaris?

I've been noticing that my Toyota Yaris is not as fuel efficient as when I first bought it. What are some ways I can improve its fuel efficiency?

One way to improve fuel efficiency is by keeping your tires properly inflated. This can help reduce rolling resistance and improve gas mileage.

Another way is to avoid sudden stops and starts while driving. This can help save fuel by utilizing the car's momentum.

Regular maintenance, such as oil changes and replacing air filters, can also greatly improve fuel efficiency.