What is the best way to improve fuel efficiency in a Ford S-Max?

I just purchased a Ford S-Max and I am looking for ways to improve its fuel efficiency. I am open to both technical modifications and driving habits. Any advice is appreciated.

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

Consider installing a cold air intake system. This can increase horsepower and improve fuel efficiency.

Another option is to regularly maintain your car's engine, including changing the oil and air filter. This can keep your car running efficiently and save you money on gas.

Avoid aggressive driving and try to maintain a steady speed while driving. Sudden acceleration and frequent braking can decrease fuel efficiency.