What are the common issues with the Audio A2's fuel efficiency?

I've noticed my Audi A2's gas mileage has been decreasing lately. I've kept up with regular maintenance, what could be causing this decline?

To improve your car's fuel efficiency, make sure to regularly check your tire pressure. Under-inflated tires can significantly impact your gas mileage.

Another potential cause for your decrease in fuel efficiency could be a clogged air filter. Replacing your air filter is a simple and cost-effective solution that can improve your gas mileage.

Make sure to avoid driving with excess weight in your car. The heavier your car, the more fuel it will consume. Consider removing unnecessary items from your trunk or backseat.