Why does the Audi A1 have a smaller curb weight than other models in its class?

I've noticed that the Audi A1 has a curb weight that is lighter than its competitors. Is this due to a specific design feature or material used in its construction?

The Audi A1 has a smaller curb weight due to its lightweight construction and use of aluminum in key components like the chassis and engine.

The Audi A1's lightweight design is achieved by using innovative materials like carbon fiber and high-strength steel, while still maintaining structural rigidity and safety.

By utilizing advanced engineering techniques and materials like magnesium alloy, the Audi A1 is able to achieve a smaller curb weight without sacrificing performance or durability.