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The 22 DeLuxe Suites are decorated in colonial period style and offer either a king-sized or twin beds. The 118 square feet accommodates a bedroom, en suite with shower and a lounge area. The 76 square feet 15 Pullman compartments offer sofas that convert into either twin or double beds in the evening with en suite bathrooms. The EGR system routes many of the exhaust gases (6 ? 10%) through the EGR valve, last on the Intake System, and in the end in the combustion chamber. The exhaust gases are inert i.e. they don't burn within the combustion chamber; also, the exhaust gases use up a number of the space which could preferably be taken with the intake air. This decreases the volume of intake air available for the combustion process during each Power Stroke; which experts claim decreases the peak combustion temperatures. This leads to lower NOx emissions.