Market researcher Ace Metrix says Mercedes-Benz is the most effective luxury automotive brand of 2015. The scoring so far is from January to Oct. 31. Mercedes received an “ace score” of 599, up from 592 in 2014, when the company also was named most effective automotive brand in advertising. Coming in second, and moving up one spot from 2014, was Buick, just six points behind Mercedes, at 593. Buick finished third in 2014 with a score of 579.