What is the best way to improve mileage in a Ford Transit Custom?

I just purchased a Ford Transit Custom, and I'm looking to improve its fuel efficiency. What are some tips and tricks that can help me get the most out of my vehicle's mileage?

Regularly check and maintain your tire pressure. When your tires are properly inflated, it can improve your fuel efficiency by up to 3%.

Avoid aggressive driving and maintain a steady speed on the highway. Sudden acceleration and braking can significantly decrease your mileage.

Consider using a fuel additive or octane booster to improve your engine's performance and increase fuel mileage.