The usually tranquil country roads of California’s premier wine region once again resound with the revving of supercharged engines and flash with glints of polished chrome as a select cadre of Robb Report readers gather at the Meadowood resort in Napa Valley to determine which of the new 2014 sports and luxury models will be selected as our next Car of the Year. Over the course of the next week, these dedicated drivers will test the mettle of the marques represented in this year’s roundup—including being among…