Why does my Audi A5's fuel economy decrease when driving up steep hills?

I have noticed that when driving my Audi A5 up steep hills, the fuel economy seems to decrease significantly. Is this normal for this type of vehicle or should I have it checked by a mechanic?

This decrease in fuel economy is a common issue with the Audi A5, especially when driving up steep hills. The vehicle's engine is working harder to maintain speed and this can result in lower fuel efficiency. To improve your fuel economy, try shifting to a lower gear while going up hills and avoid sudden acceleration or braking.