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    Horrible gas mileage.. something wrong?

    Hey all.. just joined the forum.. I have a 2008 Yukon SLT, and I was wondering what kind of MPG others are getting? The rating is 14/19, but I am averaging 13.6 after 15,000 miles. Tire pressure is 36, air filter clean.. 70% highway miles... easy on the accelerator...87 grade fuel. So I am...

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