How can I improve my Ford S-Max's fuel efficiency?

I've been noticing that my Ford S-Max's gas mileage isn't as good as it used to be. What can I do to improve its fuel efficiency?

One way to improve your Ford S-Max's fuel efficiency is to regularly check and replace your air filter. A dirty air filter can decrease gas mileage by up to 10%. Make sure to replace it every 12,000-15,000 miles.

Another way to improve fuel efficiency is to maintain proper tire pressure. Underinflated tires can decrease gas mileage. Check your tire pressure monthly and make sure it matches the recommended pressure in your car's manual.