DEF is used as a catalyst for the Catalytic Converter to remove NOx from the exhaust stream, unlike gasoline engines, the exhaust stream on a diesel isn't consistently hot enough to allow the catalytic converter to do it's job, that is why DEF is added. Also the amount of NOx in the exhaust is a function of the how hard the engine is working and this means the amount of DEF required varies. There is also a requirement to not allow excess DEF (ammonia) pass through catalytic converter.
That is to say that the amount of DEF varies depending on load and is not directly tied to the amount of diesel consumed or miles driven.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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