Glow plugs are used to aid in starting a diesel engine. They work by heating the air in the combustion chamber, which helps to vaporise the diesel fuel and create a more combustible mixture. This can lead to improved engine performance and fuel efficiency, particularly during cold starts.
However, glow plugs do not directly affect the fuel mileage of a vehicle once the engine is running. Fuel mileage is primarily affected by factors such as driving habits, vehicle maintenance, tyre pressure, and fuel quality.
So while glow plugs can indirectly impact fuel efficiency, their primary function is to assist in starting a diesel engine, not to improve fuel mileage.
