Do not buy this product. It does not work and they do not stand behind there guarantee. I have used this product only to get less miles per gallon. WHEN I TRIED TO contact the company. They do not reply and you can not get through the telephone number they give you. Save your money. Do not buy. Fraud and rip off... There guarantee claims they will DOUBLE YOUR MONEY BACK... What a joke... They will not even give you the price you paid for it.
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