Depends on the car but it basically reduces the effort needed by your car. It adjust the throttle, making you accelerate at a slower rate (cuts the horse power and torque). Its adjusts your AC so cooling the car takes longer. It adjusts the transmission by shifting at lower RPMs. But again the features change from car to car.
Dont use ECON if you’re towing, on super hot days you need AC and if you need to pass another car.
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