Why does my Audi A2 have a low fuel efficiency at high speeds?

I have noticed that my Audi A2 only gets about 25 mph at high speeds. Is this normal or is there a specific reason for this?

The Audi A2 is designed for maximum efficiency in city driving and stop-and-go traffic. At high speeds, the car's aerodynamics may not be as efficient, resulting in reduced fuel efficiency. Consider adjusting your driving style and avoid constantly accelerating and braking at high speeds.