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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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