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On my 2008 Dodge I received a DVD in the owners packet as well as some written instructions. Basically it tells me that if the Overhead indicater says 80% full or more, I need to get on the highway and drive at not less than 50 mph for 30 minutes minimum. During this time an 'active' regeneration takes place. If I slow down below 50 mph the regeneration stops until such time as I go above 50 again for 2 minutes as I recall (it has been awhile since I've watched this thing). I do notice that now that it has gotten colder (originally got the truck last May), I drive (solo) 60 plus miles to Salina and it is just starting to build mpg again so it does take some time and mileage to do this regeneration.
I've never noticed it taking anywhere near this long if I am towing -- feel it has to do with pulling harder (and hotter) than when solo.
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