General Motors Corp. is hoping that after 20 years the motoring public has forgotten the V-8-6-4 powerplant offered by Cadillac in the '81 model year. That's because the automaker is developing an upgraded version called Displacement on Demand that would allow a V-8 to operate as a V-4 in order to conserve fuel, especially among large sport/utility vehicles (SUVs) and trucks, the targets of gas guzzler charges. “We tried this before and failed,” admits Fritz Indra, executive director of ...

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