DEF Usage 2014 Tiffin Red with Cummins Diesel
Just got info for an RV tour to the Maritime Provinces in Canada. They advise that DEF at the pump is not readily available in some areas. I always just fill when I get down to a half a tank so am no...
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It varies by engine size and fuel mileage. My 8.3 L 380 HP Cummins uses about 2 gallons of DEF to every 100 gallons of diesel fuel.
