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Just another cost. And usage depends on driving situations and mikes. Bought our coach hauler with 142k on their clock. Was used prior for same duty towing a 5er. Initial voyage had to get DEF and at 3k mile later had to do again. Using it as a DD also with stop n go driving.
Maybe the estimated DEF usage is based on Hwy, in-tow and new only? Same reason MPG numbers are always spot-on! (sarcasm) ��
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