FILE - In this Nov. 18, 2012, file photo, Mario Andretti, left, talks to Willy T. Ribbs before the Formula One U.S. Grand Prix auto race at the Circuit of the Americas in Austin, Texas. IndyCar is making an improved push to diversify its fanbase and its driving field. Ribbs and George Mack are the only two drivers to ever start an Indianapolis 500. (AP Photo/Darron Cummings, File)