What is the best way to increase the fuel efficiency of a Ford Galaxy?

I own a Ford Galaxy and I've noticed that it's not as fuel efficient as I would like. What are some tips or modifications I can make to improve its fuel efficiency?

One of the easiest ways to improve fuel efficiency is to regularly change your air filter. A dirty air filter can decrease fuel efficiency by up to 10%.

Another tip is to avoid idling for long periods of time. If you're stuck in traffic, turn off your engine instead of idling. This can save a lot of fuel in the long run.

I would also recommend checking your tire pressure regularly. Under-inflated tires can decrease fuel efficiency and also affect handling and safety.

One modification you could make is adding a cold air intake. This can increase horsepower and fuel efficiency by allowing colder air to enter the engine.