General Motors President Dan Ammann, from left; Ed Welburn, head of global design for GM, andandnbsp;Duncan Aldred, head of global Buick sales, pose with the Avista coupe concept after it was introduced Sunday in Detroit.
General Motors President Dan Ammann, from left; Ed Welburn, head of global design for GM, andandnbsp;Duncan Aldred, head of global Buick sales, pose with the Avista coupe concept after it was introduced Sunday in Detroit.