Why does the Audi A3 have such good gas mileage?

I've heard from multiple sources that the Audi A3 has great gas mileage, even for a luxury car. What makes it so efficient? Is it just the engine or are there other factors at play?

The Audi A3's excellent gas mileage can be attributed to a few different factors. First, its compact size and aerodynamic design help to reduce drag and make it more fuel efficient. Additionally, the A3 utilizes advanced engine technology, including turbocharging and direct injection, to maximize fuel economy without sacrificing performance.