How can I improve the fuel efficiency on my Toyota Prius?

I have noticed that my Toyota Prius's fuel efficiency has decreased. What steps can I take to improve it?

Make sure your tires are properly inflated to the recommended pressure, as under-inflated tires can decrease fuel efficiency.

Consider replacing your air filter, as a clogged air filter can reduce air flow and decrease fuel efficiency.

Avoid excessive idling and use the car's electric mode as much as possible for short trips.