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Power Strokes
6.7 Aftermarket
Mpg
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[QUOTE="ckrueg, post: 1500866, member: 12403"] Yeah the whole goal of EGR is to cool combustion temps to reduce NOX, which also decreases the thermal efficiency of the engine. It also requires running more boost at any given time because a large portion of the air being sent in to the intake is exhaust which has very little oxygen. Part of the reason they went to DEF was so they could run less EGR while maintaining low NOX emissions. That's one reason why 6.7s get better mpg than 6.4s and why the newer rams with DEF do better than those without. Sent from my SM-N950U using Tapatalk [/QUOTE]
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