The 2016 Indianapolis 500 (branded as the 100th Running of the Indianapolis 500 presented by PennGrade Motor Oil for sponsorship reasons) took place on Sunday, May 29, 2016, at the Indianapolis Motor Speedway in Speedway, Indiana. It was the premier event of the 2016 Verizon IndyCar Series season. In a shocking finish, 24 year-old rookie Alexander Rossi of Andretti Herta Autosport w/ Curb-Agajanian won the race on fuel mileage over Carlos Muñoz and Josef Newgarden. Two-time winner Juan Pablo Montoya entered the race as the defending champion.
Over the final ten laps, most of the leaders were cycling through pit stops, as no one was expected to make it to the finish without pitting for fuel. Most drivers had not pitted since the previous caution that ended on lap 166. Alexander Rossi's team took a huge gamble and coached the driver into saving fuel. As the other leaders made their stops, Rossi inherited the lead on lap 197. He slowed down to save fuel, but on the final lap Carlos Muñoz began charging to catch up. Coming out of turn four on the final lap, Rossi pulled to the inside and literally coasted across the finish line, to take the checkered flag. Muñoz finished 4.4975 seconds behind, his second runner-up finish at Indy (2013, 2016). Rossi was out of fuel, and came to a stop during his cool down lap. A tow truck brought him in, believed to be the first time in Indy history the race winner was towed back to victory lane.
The 2016 race marked a milestone as the 100th running of the Indianapolis 500. The race came five years after the event's Centennial Era, a three-year long commemoration which celebrated the 100th anniversary of the opening of the circuit (1909), and the 100th anniversary of the first Indy 500 (1911). The 2016 running was the ninety-ninth scheduled 500-mile race of the canon, as the 1916 race was scheduled as a 300-mile race. It also commemorated the bicentennial of Indiana statehood.
The month of May activities at the Speedway opened May 14 with the third annual Grand Prix of Indianapolis. Indianapolis 500 practice began on Monday, May 16. Time trials were held on May 21–22, with James Hinchcliffe winning the pole position. Carb Day, the traditional final practice session, and the annual Pit Stop Challenge, was held May 27. Considerable pre-race hype surrounded the milestone event, and for the first time the race was announced as a complete sellout (both grandstand tickets and infield). Due to the sellout, the local television blackout of the ABC broadcast was lifted for the first time ever.
Race background
Going into the race, Simon Pagenaud of Team Penske had mostly dominated the first five races of the 2016 IndyCar season. He finished second in the first two events (St. Petersburg and Phoenix), and won the next three races (Long Beach, Alabama, and the Grand Prix of Indianapolis) to take a sizable lead in the championship points standings.
The most discussed issues in the weeks leading up the race involved the ongoing development of aero kit regulations, and the competitive balance between the two engine manufacturers (Chevrolet and Honda). After three major crashes in 2015, in which cars flipped over and became airborne, series officials attempted to address the situation by adding "dome skids" - aerodynamic devices affixed to the undertrays of the cars, designed to keep the cars on the ground during a crash. This rule change was met with some resistance, particularly from the Honda teams, after testing revealed them to be unsettling to the cars' handling. After practice opened, however, the issues appeared to have been mostly resolved. None of the crashes that occurred during practice or qualifying saw the respective cars flip over. With respect to the engine competition, Chevrolet entered the month having swept all five race wins and all five race pole positions. In addition, Chevrolet had noticeably outperformed Honda in the 2015 race, sweeping the top five spots in qualifying, as well as the top four positions on race day. After practice opened, however, Honda teams led the speed chart on three of the four days (one day was rained out), and also secured the pole position - Honda's first Indy 500 pole since 2011.
Early in the month of May, Speedway officials announced that the grandstand seating for the race had sold out. It marked the first sell-out since before 2003.
On May 25, Speedway officials announced that the race had reached a total sellout with all general admission tickets sold. In addition, it was announced that for the first time since 1950, the race would not be blacked out for the local audience.