Numbers to note following the Iowa Corn 300 at the .894-mile Iowa Speedway oval -- the 13th round of the Verizon Indy Car Series season:

1 -- First podium finish for Sage Karam (20 years, 4 months, 15 days).

5 - Positions gained by Rahal in the final 30 laps of the race (ninth to fourth).

5.25 - Average running position of winner Ryan Hunter-Reay.

6 - American drivers in the top seven positions. The last time American drivers swept the top four positions in an Indy car race was at Chicagoland Speedway in 2001 (Jaques Lazier, Sam Hornish Jr., Eddie Cheever Jr. and Jeff Ward).

7 - Wins for Andretti Autosport in the nine races at Iowa Speedway (three by Hunter-Reay and one each by Dario Franchitti, Tony Kanaan, Marco Andretti and James Hinchcliffe).

15 - Indy car wins for Hunter-Reay, who tied Alex Zanardi for 30th on the all-time list. … Positions improved by Sebastien Bourdais (24th to ninth), most of any of the 24 starters.

18 - Races without a DNF by Juan Pablo Montoya before his streak ended at Iowa Speedway. Montoya’s last DNF was also at Iowa Speedway in July 2014.

44 - Poles earned by Helio Castroneves, which ranks fourth on the all-time list. Mario Andretti (67), A.J. Foyt (53) and Bobby Unser (49) are 1-3 on the list.

46 - Laps in which Rahal improved his position, most of any driver.

246 - Consecutive starts by Kanaan, extending his all-time record that started in 2001.

1,857 – Laps completed by Marco Andretti, the only driver to complete every lap of every race in 2015.