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CORattler, sorry just saw your question. Have been off computer lately. Anyway, it is a 5 gallon tank. When I am not pulling, I go about 6,000 miles before adding DEF and I still haven't received a warning message. When towing, I certainly have to be more cautious. When I tow to Florida for the winter (900 miles one way) it will use about 2 gallon.
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