How does the efficiency of the Audi A5 Engine compare to its competitors?

I'm interested in purchasing an Audi A5, but I want to know if its engine is more efficient compared to its competitors such as the BMW 4 series or the Mercedes-Benz C-Class. Can someone provide some insights?

The Audi A5 has a highly efficient engine that outperforms its competitors. With its advanced turbocharged technology, the A5 is able to achieve better fuel economy without compromising on performance.

As a previous owner of both the A5 and BMW 4 series, I have to say that the A5 has a more efficient engine. It's a well-balanced car with a powerful engine and great fuel economy.