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No question you should see better mileage after a regen. Think about what the regen is doing, it's burning off air restricting particulates. As particulates within the filter increase, your airflow decreases. Not to mention the regen itself is burning excess fuel.
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2003 350 Lariat FX4 Short Box 6.0L *SOLD*
2008 FX4 F350 6.4L Dually Long Box, Black on Black PICTURES
2007 Keystone Raptor 3712TS PICTURES
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