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Typically def consumption is around 2% of the amount of fuel= 2gal def per 100 gal fuel,
but as the system age's that will gradually increase a little, def consumption is controlled by the ecm and doses the amount of def to the nox level in your exhaust so as the system ages it becomes less efficient and consumes more def to achieve the 80% reduction in nox from the inlet to outlet of the system.
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