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If someone could give me a good sound reason as to why this could be possible, other than "my MPG went up because they are so awesome it had to" then I would go buy a set and have them in my car tomorrow. MPG is a HUGE deal to me. But I'm not going to buy snake oil without concrete proof that it works.
And simply put, there are too many confounding variables in your testimony to make me believe its possible.
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