Why is the fuel consumption of my Audi A1 increasing?

I have noticed that the fuel consumption of my Audi A1 has increased significantly in the past few weeks. I have not made any changes to my driving habits or the car itself. What could be causing this sudden increase and what steps should I take to improve it?

First, I recommend checking your tire pressure. Low tire pressure can cause your car to use more fuel. Also, make sure to regularly check and replace your air filter if needed. Additionally, avoid unnecessary idling and try to combine trips to reduce mileage.