Luxury cars go green, still find buyers

When Johan de Nysschen, President of General Motors’ Cadillac luxury brand, was presenting the CT6, the new flagship luxury sedan, at the New York auto show last week, he boasted about a surprising feature of its 400hp engine. Some of its six cylinders would automatically deactivate when not needed, Mr de Nysschen said, as part of an effort to make the vehicle exceptionally fuel-efficient for its size.