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6 6l Duramax Diesel

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The '11 6.6L Duramax diesel V-8 not only produces more power and torque, but it's more efficient too, improving highway mileage up to 11 percent, says GM. Be prepared to pay $8,395 for the Duramax/Allison transmission option. They are listed separately on the sticker (Duramax, $7,195; Allison, $1,200), but you can't get one without the other.