What is a recommended practice to reduce vehicle emissions?

Changing the oil and air filter on a regular basis is an effective practice to reduce vehicle emissions. Regular oil changes help to keep the engine lubricated and functioning efficiently. Clean oil reduces friction within the engine, which can lead to lower emissions as the engine works more smoothly. Additionally, a clean air filter ensures that the engine receives sufficient airflow, optimizing fuel combustion. When both oil and air filter are maintained, the engine operates more efficiently, leading to reduced harmful emissions and better fuel economy. This practice contributes positively to both environmental health and vehicle performance.

Driving at a constant high speed typically results in increased fuel consumption and higher emissions, while increased use of air conditioning can also elevate fuel use, negatively impacting emissions. Using premium gasoline does not necessarily correlate with lower emissions unless the vehicle is specifically designed to benefit from it, and it may not address the general efficiency of the engine in relation to emissions.