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Message: [QUOTE="Dzchey21, post: 1377494, member: 63"] Like stated above the two items are different dEF reduces NoX. By using def the engines are allowed more timing and less egr. This allows for higher EGTs which makes the *** stay cleaner because you are hitting the target 1086 degree temperature that allows spot to be converted to gas. The other end of that coin is the more heat the more DEF that needs to be injected. So if you tow a lot you will use more def but regen less If you put around you will regen more but use almost zero def. the factory air to water also does a good job to help keep EGTs up even during light load situations. Your truck should use about a gallon every 1000 miles under mixed usage. Hope this helps [/QUOTE]

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