Cummins were kind of the same way. The early 6.7 emissions vehicles (probably 2010-2013 ish) got worse mpg compared to the previous 5.9's with no emissions crap on them. I just picked up a 2016 2500 Mega cab and so far I am seeing the same mpg as I did on my non-emission 2006 5.9 and it feels more powerful. I would love to delete it (after warranty) but willl wait until I leave this state so I don't get stuck doing emission testing/
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