the test explicitely mentions "placebo effects" having an influence on results of non-scientific tests, because people expect a decrease of fuel consumption, which leads them to subconciously change their driving.
thats not bad. but with conciously adjusting your driving style you can easily save up to 30% fuel. without extra costs for some pills.
many producers claim that their products "kick in" later, with various explanations, because they know that scientific tests become unaffordable beyond a certain time (3rd - 5th filling means several thousand test kilometers!).
since the test was performed over 800 km each test car had at least 2 fillings.
assuming that the pill's effect would increase over time, at least a slight fuel saving should have been measured.
but 0% effect measured.
at least the pills didnt block the carburetor.
i would trust your mentioned experiences more, if you wouldnt want to distribute those pills.
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