Cigarette Lighter Device Said To Improve Car’s Fuel Effeciency By 18%

Money quote: The device mitigates electrical interference from the stereo, lights, air conditioning, and more that can negatively affect the ECU’s ability to optimize fuel injection and fuel efficiency.

Silliness. My lighter is on a different circuit from the ECU. And doesn't the ECU have maybe a couple of capacitors in front of it to clean up noisy power?