2004 Chevrolet Tahoe LT 5.3 ltr. flex fuel. So far I cannot tell any gas mileage improvement. I guess it is exhausting cleaner, but not required to put the tale pipe sniffer in for inspection anymore so I will not know. I was hoping for gas mileage improvement more than anything else as I am not a greeny type of person. I remember someone saying it gets better with age. I hope so.
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