A clogged cabin air filter can indeed have an impact on a vehicle's gas mileage. The cabin air filter plays a role in maintaining proper airflow through the HVAC system, which includes the ventilation and air conditioning components. If the filter becomes clogged with debris, dust, and contaminants, it can restrict the airflow entering the cabin and hinder the overall efficiency of the HVAC system. As a result, the system might need to work harder to maintain the desired temperature and airflow, which can lead to increased energy consumption. While the direct impact on gas mileage might not be substantial, consistently reduced HVAC efficiency can contribute to a slightly lower overall fuel efficiency over time. Regular maintenance, including replacing the cabin air filter at recommended intervals, can help ensure proper airflow and contribute to better gas mileage and overall vehicle performance.
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