Mixture control refers to the process of adjusting the ratio of fuel and air in an engine to optimize performance and efficiency. This balance is crucial for ensuring that the engine runs smoothly, produces the desired power, and minimizes emissions. In modern vehicles, electronic control units (ECUs) often manage mixture control using sensors to monitor conditions like temperature and pressure. By continuously adjusting the fuel-air mixture, these systems help improve fuel economy and reduce harmful pollutants, contributing to a cleaner environment.