Review on Fuel Efficient Car Saver by Danny Flores

So I tested this product for a few weeks or over 500 miles. According to the package instructions, the mileage should be increased after 150 km. Unfortunately no difference. I have to agree with other reviewers (who go into great detail on the technicalities of this product) reporting that this product sells "hope for fuel savings" rather than "actual fuel savings". And with its claim of 15% mpg improvement - who's to say? That's around 1-3mpg, depending on your car's typical mpg... not to mention the greater impact that highway driving versus city driving can have on our mpg. However, I can report that it did not damage or damage my vehicle's ECU, which is a good thing. Just know that you are buying "snake oil".