General Motors Chief Financial Officer Dan Ammann drives in a gray-metallic Corvette Z06 on the test track at GM’s proving ground in Milford, Michigan. Ammann wants it understood he’s not one of the gray-suited “bean counters” who once dominated, and nearly destroyed, General Motors. To drive home the point, the chief financial officer is ready to challenge the automaker’s resurgent “car guys” on their own turf: a three-mile test track where his gray-metallic Corvette Z06 reaches a blistering 150mph. Every lap is a message - this is not the same hidebound finance department that almost ran the top US automaker into the ground. from gulf times.