Kiwi driver Scott Dixon remains second overall in the IndyCar standings with two races remaining, after his clutch runner-up finish in the latest race in Illinois.
The race was won by series leader Josef Newgarden, who led for 170 of the 248 laps en route to his seventh career victory.
Dixon started seventh on the grid and finished 0.6850 behind the American.
"I guess that's the best we could have hoped for," Dixon said post-race.
"It's was definitely going to be a tough race for us, but the car was actually very good. I think we had a better mechanical grip than the group we were racing with - with the Penskes - and especially toward the end of the run."
Frenchman Simon Pagenaud was third, followed by Helio Castroneves and Conor Daly.
The next race of the series will take place in New York next month.