How can I make my Toyota Yaris more fuel efficient?

I recently purchased a Toyota Yaris and I've noticed that it's not as fuel efficient as I expected. Are there any tips or tricks I can use to improve its fuel efficiency? I don't want to spend too much on gas and I want to do my part for the environment.

One way to improve fuel efficiency is to make sure your tires are properly inflated. Under-inflated tires can decrease fuel economy by up to 3%. You should also avoid idling for extended periods of time and try to keep a consistent speed when driving on the highway.

Another tip is to avoid carrying excess weight in your car. The more weight your car has to carry, the more fuel it will use. So make sure to clean out your trunk and remove any unnecessary items.

It's also important to keep up with regular maintenance, such as oil changes and tune-ups. A well-maintained car is more fuel-efficient and will last longer. You can also consider using a fuel additive to improve your mileage.