To improve the mileage of a Yamaha MT-125, several key strategies can be employed. First, ensure regular maintenance, including timely oil changes, cleaning the air filter, and checking the spark plugs, as a well-maintained bike runs more efficiently. Maintaining the correct tire pressure is crucial, as under-inflated tires increase rolling resistance and fuel consumption. Check tire pressure regularly and keep it at the recommended levels. Adopt smooth riding habits, such as gradual acceleration and anticipating stops to minimize braking. Riding at optimal speeds, typically between 40-60 km/h, can also significantly improve fuel efficiency. Avoid excessive idling; if you need to wait, turn off the engine to save fuel. Using high-quality fuel from reputable petrol stations is also important, as poor quality fuel can affect engine performance and reduce mileage. Additionally, keep the motorcycle clean and avoid unnecessary modifications, as these can impact aerodynamic efficiency and add extra weight, both of which can reduce mileage. Finally, consider retuning the carburetor or, in the case of fuel-injected models, ensuring the fuel system is optimized, as this can enhance the engine's work capability and improve mileage.