A dozen different drivers took to the 2.385-mile, 12-turn Sonoma Raceway road course for a private test day prior to the INDYCAR Grand Prix Of Sonoma. They included the four Andretti Autosport (Marco Andretti, Ryan Hunter-Reay, Alexander Rossi, and Zach Veach), three Dale Coyne Racing/Dale Coyne Racing With Vasser-Sullivan (Sebastien Bourdais, Pietro Fittipaldi and Santino…