Why does my Audi A3 consume more fuel than usual?

I have noticed that my Audi A3's fuel consumption has increased significantly in the past few weeks. What could be the possible reasons for this and how can I fix it?

The increased fuel consumption could be due to a clogged air filter. It is recommended to replace the air filter every 12,000 to 15,000 miles to ensure that your car's engine is getting enough oxygen for efficient fuel combustion.

Another common cause for higher fuel consumption in Audi A3s is a faulty oxygen sensor. The sensor measures the amount of oxygen in the exhaust and helps the engine adjust the fuel-to-air ratio for optimal performance. A malfunctioning sensor can lead to higher fuel consumption.

Check your tire pressure regularly as underinflated tires can increase fuel consumption by up to 3%. Invest in a tire pressure gauge and make sure your tires are inflated to the manufacturer's recommended PSI for optimal fuel efficiency.