Why does my Audi A4 lose power at high speeds?

I have noticed that my Audi A4 struggles to maintain its performance at speeds over 70 mph. The car seems to lose power and struggles to accelerate. What could be causing this issue and how can I resolve it?

This could be due to a dirty air filter, which can restrict airflow and reduce engine power. I recommend checking and replacing the air filter if necessary to see if it improves your high-speed performance.

Another potential cause could be a clogged fuel filter, which can restrict fuel flow to the engine and cause a loss of power. Consider having the fuel filter checked and replaced if needed to see if it helps your issue.

It's possible that there could be an issue with the fuel injectors. If they are clogged or malfunctioning, it can impact the engine's performance at higher speeds. I suggest having the injectors inspected and cleaned or replaced if necessary.