How much does the exhaust effect on fuel consumption?

The exhaust system can significantly impact fuel consumption by influencing engine efficiency. A well-designed exhaust system enhances the expulsion of exhaust gases, which can improve engine performance and fuel efficiency. Conversely, a clogged or inefficient exhaust can restrict airflow, leading to increased fuel consumption as the engine works harder to operate. Overall, optimizing the exhaust system is crucial for achieving better fuel economy.