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      01-09-2013, 10:30 AM   #7
The X Men
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Drives: 2015 535xi 2013 X3 35i
Join Date: Mar 2012
Location: MA

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BMW's valvetronic system is similar with Audi's Valvelift System, they are both basically varible valve system, invented by Honda years ago. The S6's cylinder deactivation works together with the Valvelift System to increase fuel efficency. Thats one of the reason why the S6 gets 17/27 MPG while the 550xi only get 16/24 MPG.