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Old 04-18-2013, 01:03 PM   #8
XDCX
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Join Date: Nov 2007
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Quote:
Originally Posted by mryan55 View Post
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...
Thanks for the update.

I was checking out a Dodge/Cummins forum and noticed a lot of members were referring to DEF on the 2012 C&Cs - now it all makes sense.

There were also a number of threads from 2012 and prior 6.7 Cummins owners who were removing their Particulate Filter to increase fuel economy. This wouldn't answer lsxonly's question since he was referring to 2013 trucks but it does add to the theory that the new emissions requirements have impacted fuel economy.
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