The auto industry may be downsizing engines under government mandates, but flat-6s, V8s, and V-12s were the headliners at the third annual American Speed Festival, Sept 29-Oct 1. ASF celebrated 100 years of the 24 Hours of Le Mans, 70 years of Corvette, and 50 years of the International Race of Champions at M1 Concourse auto club. The event put an exclamation point on a month of Detroit auto shows including Detroit 4fest, Detroit Auto Show, and Concours d’Elegance. - Auto Report, 910AM-Detroit.