I installed the Fuel Shark Device on my used Mercedes SLK to save fuel. According to my fuel indicator I made almost 20 km/liter at an average speed of 100Km/hour. It's fine!
But I would like to know the opinion of my TMC friends also because the Fuel Shark Device is an American device and you know certainly much more than me on this matter.
But I would like to know the opinion of my TMC friends also because the Fuel Shark Device is an American device and you know certainly much more than me on this matter.