How does the Audi A1's aerodynamics contribute to its fuel efficiency?

I'm looking to purchase the Audi A1 and was wondering about its fuel efficiency. I've heard that its aerodynamic design plays a role but I'm not sure how.

The Audi A1's sleek and aerodynamic design not only looks great, but it also helps to reduce drag and improve fuel efficiency. This means you'll spend less money on gas and also do your part for the environment. As for specific numbers, the A1 has a coefficient of drag of just 0.31, which is impressive for a small hatchback.