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  1. C

    07 Tahoe issues

    my 2007 was doing the same things. I install a Range computer that keeps it from shifting down to 4 cyl. Oil use went from a quart every 1500 miles to about a 1/2 qt. every 3000 miles. Highway mileage fell from about 20.4 to 19.7 from last trips. About once a month I have to unplug and plug back...
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