There are two buttons near the shifter, the ECT Power button and the O/D (overdrive) button. The overdrive locks you out of fourth gear, so your rpms will be higher than normal when you are driving above 40 mph. This button it usually located on the side of the shifter itself, and it will consume considerably more fuel and may wear your engine out faster when you are on the highway. The little black button located next to the shifter will put the car into ECT (electronically controlled throttle) Power mode. This makes your throttle slightly more agressive, consuming more fuel, but it won't hurt your car.
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