GM’s Displacement on Demand system. CHICAGO – General Motors Corp. has been debating whether its 2005 Displacement on Demand (DOD) fuel-saving system for V-8 engines should engage an instrument-panel indicator when the system is in operation. The indicator could serve as a guide for drivers seeking to maximize fuel economy from the DOD system that shuts down half of the V-8’s cylinders when not needed. (See related story: GM Wows Washington With DoD, Fuel Cells) One reason for ...

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