Does turning on ECO mode save fuel in a car?
2 Answers
Turning on ECO mode in a car can save fuel. ECO mode primarily makes comprehensive judgments and analyses during vehicle movement regarding factors that affect fuel consumption, such as automatic transmission gear position, engine speed, vehicle speed, braking, and transmission oil temperature. The ECU control unit then calculates the optimal fuel quantity to supply the engine for operation, effectively reducing fuel consumption compared to normal driving modes. Simply put, it controls the engine speed with appropriate gear positions to minimize unnecessary fuel consumption. There are situations where it is unnecessary to activate ECO mode: When the car is driving at high speeds (up to 100km/h), even if ECO mode is turned on, the vehicle's computer will prioritize speed, causing the ECO mode to automatically deactivate. When high torque output is needed, such as when climbing a hill, the engine computer will prioritize ensuring and providing sufficient power to drive the vehicle, causing the ECO mode to automatically deactivate.
I've been driving for several years and have tried the ECO mode in different car models. It indeed helps save fuel, especially in urban traffic jams where the effect is most noticeable. ECO reduces unnecessary fuel consumption by lowering engine responsiveness and adjusting transmission shift points. During daily commutes, fuel consumption can decrease by 5% to 10%, but the difference is minimal on highways since the engine is already efficient. I recommend making it a habit to use ECO, but remember it slows down acceleration—turning it off during overtaking or uphill climbs is safer for better performance. Pairing it with smooth throttle control enhances fuel-saving effects. Long-term use can save hundreds in fuel costs and is also better for the environment. However, regularly check your vehicle's condition, as older ECU systems may be less effective. In short, enabling ECO is a practical and money-saving tip.
