Why is the Ford Fiesta known for its high fuel efficiency?

I'm looking into purchasing a Ford Fiesta and I keep seeing that it has great fuel efficiency. What makes the Ford Fiesta stand out in this aspect compared to other cars in its class?

I don't own a Ford Fiesta, but I've done a lot of research on it and it seems that the lightweight design and aerodynamic shape of the car contribute to its fuel efficiency. Plus, Ford has been continuously improving the engine over the years.

I've owned a Ford Fiesta for a few years now and the main reason I chose it was for its fuel efficiency. The engine is designed to maximize fuel economy without sacrificing power.