Quote:
Originally Posted by Dieselman
Not quite correct. An open EGR valve reduces pumping losses due to the restriction caused by the throttle flap, without allowing any more oxygen into the cylinders.
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We are talking about a gas (petrol) engine here right? as the diesel technically does not have a throttle plate because it does not need to operate at a specific air fuel ratio. Therefore both posts may be correct. EGR hurts mileage in some diesels but may help low load mpg in gasoline vehicles due to reduced pumping losses.