Australian IndyCar star Will Power has averaged almost 370km/h to be fastest on the opening day of practice for the Indianapolis 500.

IndyCar split seven hours of track time on Tuesday into three sessions and Ed Carpenter and Helio Castroneves exceeded 367km/h in the first 30 minutes.

That was the most eventful action until the final two hours of the day, when the Penske drivers both bettered the mark of 369.53km/h that won Carpenter the Indy 500 pole last year.

Australian Power, the defending Indy 500 champion, went 369.73km/h.

Pagenaud, winner of the Grand Prix on the improvised Indy road course last Saturday, went 369.67km/h.

The Penske team returned to the garage after jumping to the top of the speed chart in an abbreviated and statement-making session that marked the opening of preparations at Indy for the May 26 race.

Carpenter and Castroneves’s early laps stood to give Chevrolet the four fastest cars Tuesday.

Colton Herta had the fastest lap for a Honda driver for fifth best, but the rookie spun with 38 minutes remaining in the day for the only caution not related to debris.