What is the most efficient way to improve fuel economy in my Audi A5?

I recently started noticing a decrease in my Audi A5's fuel economy and I'm looking for ways to improve it. What are some practical tips or modifications that I can implement to increase my car's fuel efficiency?

One easy way to improve fuel economy is to properly inflate your tires. Underinflated tires can decrease your car's fuel efficiency by up to 3%. Make sure to check your tire pressure regularly and inflate them to the manufacturer's recommended level.

Another important factor in fuel economy is the weight of your vehicle. Eliminate any unnecessary items in your car to reduce its weight and improve fuel efficiency. This can be especially helpful for long trips.