Why does the Audi A3 have a lower fuel economy than other vehicles in its class?

I've noticed that the Audi A3 has a lower fuel economy compared to other vehicles in the same class. What factors contribute to this difference and how can I improve the fuel efficiency of my A3?

The Audi A3 tends to have a higher curb weight than its counterparts, resulting in a lower fuel economy. In order to improve your A3's fuel efficiency, try to minimize the weight of items stored in your vehicle and consider switching to lighter weight tires.