IndyCar tweaks Iowa event format

IndyCar has tweaked the procedure for determining the qualifying groups for the three heat races that will decide the starting grid at this weekend's round at Iowa. Qualification groups will be decided by laptimes set during the second practice session on the 0.875 mile oval. Race one will then be made up of even-numbered positions starting from the 10th-quickest practice time, and will decide the grid from 10th downwards

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