That is a good point Tesla. Everything about these products scream scam, yet we haven't been as skeptical as with other products. It could be that I have never seen these marketed, unlike other magic products. They don't immediately claim to offer MPG gains, but rather softly say it will improve brake pad life, noise, and fuel economy. If you do try to buy them you probably have to look hard to find the right set for your car. Magic products tend to be universal application, and can be found in all the big box stores.
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