 Scott Dixon driving for Chip Ganassi Racing won the first unified title for 13 years after completing the IndyCar–Indy 500 double.Dixon took six victories over the course of the season but had to fend off a consistent championship challenge from Hélio Castroneves until the final round at Chicagoland Speedway.The original 16 race schedule, which was released on September 16, 2007, became a 19 race schedule (18 championship and 1 Non-Championship) on February 26, 2008.