 The Hy-Vee Homefront 250 at Iowa Speedway has been brought to you by Firestone, the official tire of the NTT IndyCar Series, for redefining the limits. Advanced Auto Parts, official checkered flag of the NTT IndyCar Series. Pennzoil, official motor oil of the NTT IndyCar Series. American Medical Response, official partner of the NTT IndyCar Series, and the AMR IndyCar Safety Team.