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6 months agoVery likely. Higher NOx out of the engine generally means lower fuel consumption, so the fix will likely decrease the real world mpg that owners were seeing.
I’ve not yet seen any technical information on the defeat device, but from my time in the industry I can make an educated guess how it will play out
There probably won’t be a decrease in power, as it was likely an aftertreatment issue (sizing, durability, cost cutting) that made them decide to use a defeat device. Cummins would retrofit every cheating engine with a brand new aftertreatment system at great cost rather than reduce the power of their engines. The brand damage of reducing power would far outweigh any repair and warranty costs.