Use of DEF started for MY2013 on the Ram side. Only 35/45/5500 chassis previously used DEF. I don't see how this could contribute that much to MPG numbers for the new truck, but I haven't a lot of a data to go off of either. We have yet to sell one...
Last edited by mryan55; 04-18-2013 at 12:19 PM.
Reason: Hit sumbit too soon! aack!
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