Before we get to actually explaining what Effuel is, we need to und... Most cars that have been produced in the last couple of decades have an ECU, which is an Electronic Control Unit. As the name suggests, this ECU is responsible for handling all the sensors and the electronic components of the car. Modern cars are not just about the engine and these electronic components play a massive role in determining the performance of your car and how well it drives. Now, when you connect this little device Effuel EcoOBD2 to your ECU, it starts to collect diagnostic data about the performance of your car. Once it has collected enough data, it analyses it and then tweaks the electronics of the car to make it more efficient. However, Effuel's abilities are not only limited to saving fuel as it can also increase the torque of your car by 30% and power by 35%.