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DD15 fuel mileage loss

I have a 2014 Cascadia with the DD15 and just recently lost 2mpg, down to 4-5 mpg, have replaced all the filters and had a oil service done to it. Is there anything I am missing here? Or is this the result of the winter fuel change?

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Since I posted this I have had the dpf filters and box cleaned and replaced the dozer, the mileage has come back up, but about every three weeks I have to have a forced regen done because I get a code for the after treatment dozer and it will not do a parked regen


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ive been driving for 30 yrs now an I always loose mpg in the winter between idleing an winter fuel an the winds in the winter.i slow way down an regain 1 mpg but not all of it.

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