You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract GM's Batey On Marketing Strategy, Agency Partners: 'There Is No Change' Despite Sales Drop, Ewanick's Departure, Automaker Forges Ahead By Rich Thomaselli, Published on August 01, 2012 4 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.