Answer: indycar

AnswerCrossword Clue
INDYCAR"500" race-sanctioning group
INDYCARRace-sanctioning biggie
INDYCARBrickyard racer
INDYCAR2005 17-race series
INDYCAR.. Series: auto races
INDYCARRace-sanctioning body
INDYCARSpeedway racer
INDYCARBig series name in auto racing
INDYCARSTP logo sporter, perhaps
INDYCARVehicle with an STP logo, maybe