Look at Alibaba.com and look for Fuel Saving Devices That Actually Work and you'll understand, those green and white OBD-2 gadgets are most likely what will appear via the post office in the event that you purchase a Fuel Save Expert.
As exposed various times previously, these OBD-2 gadgets have no capacity on its chip to converse with your motor's mind (also known as the ECU or the motor's PC) and can thusly not change timing, fuel, and flash on the fly to make your motor utilize less fuel.
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