When the track opened, the one-lap distance was measured as . IndyCar Series races were originally 208 laps (312 mi/500 km) long. In 2001, timing and scoring officials revised the measurement as , and the races were changed to an even 200 laps (291 mi/468.319 km). In 2007, the race was lengthened to 228 laps in an effort to create a longer product for time value purposes. Using the traditional measurement, the race became 342 miles (550.4 km). However, official IndyCar timing and scoring maintained the measurement, and the race was officially 331.74 miles (533.88 km). In 2014, the race was extended to 600 kilometers. After revamping the oval track in 2016, the new one lap measurement is 1.44 miles for lap speed calculations. In addition, the start time was moved to 9:00 p.m.
CDT (10:00 p.m.
EDT) so the event would take place almost entirely under the lights, rather than in the mid-summer
twilight. The race was slightly shortened to 300 miles and 200 laps in 2020, due to
COVID-19 pandemic protocols that used same-day practice and qualifying for the event. The
2020 Genesys 300 was the first IndyCar event since a hiatus due to the pandemic. The 300-mile distance will also be used for 2021.
Twin races For 2011, a special Twin race format was adopted, a throwback to the USAC-style twin races of the 1970s and early 1980s. The race would consist of two 275-km (114 laps) races, with each race declaring a separate winner, and each race awarding half points towards the season championship. The starting lineup for the first race was determined during standard time trials. After the completion of the first race, a "halftime" was observed, and the starting lineup for the second race was determined by a random draw. A mild controversy resulted from the halftime draw for the second race's lineup. It differed from previous "twin" races where the finishing positions for the first race determined the lineup, or the finishing positions were inverted. It was considered unfair by some, and it was magnified when points contenders
Will Power and
Dario Franchitti drew 3rd and 28th starting positions, respectively. For 2012, the twin-race format was scrapped. In
2021 Texas hosted a twin-race weekend with two separate points-paying events, named the
Genesys 300 and
XPEL 375 and held on May 1 and 2 respectively. ==Planned CART race==