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  1. 04.5-05 LLY Duramax Powertrain
    I have a 2004 Chevy Silverado 2500HD 4x4 Duramax with I belive is a LLY. Everything is stock. I have a shell with a 75 gallon transfer tank. I travel mountain highways to town some 60 miles away and 4000 ft down hill. Typically I am fairly empty going down to town. And loaded with Costco...
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