What are the disadvantages of using the ECO mode?

Although the ECO mode can reduce some fuel consumption, it may have some negative effects on driving performance. When driving in low speed for a long time, it may cause some issues, especially for the accumulation of carbon in the engine. The power of the car in ECO mode is relatively weak and it is not suitable for aggressive driving. The ECO mode may make the driver feel that the response of the throttle is slower and the speed may feel like it is increasing in a slow manner. The principle of the ECO mode is to control the engine's speed with appropriate gear to reduce unnecessary fuel consumption.