GM’s Duramax-powered Chevrolet Silverado and GMC Sierra 2500HD and ... On long highway slogs with a trailer, we found the DEF tank ran dry in as few as 750 miles. Depending on terrain, speed ...
The Diesel Exhaust Fluid (DEF) used in the ... on the new 36 gallon tank. In addition to the fuel economy improvements, Chevy claims improved acceleration with Duramax/Allison combo, resulting ...
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