Red Bull Ampol Racing's two cars have logged the most laps with three hours of official pre-season testing remaining at Queensland Raceway.
Cars #88 and #97 combined for 172 laps through five-and-a-half hours, with the latter completing a day-high 99 laps.
Zane Goddard remained at the top of the timesheets, having set his 1:09.0257s flyer on his 16th lap earlier in the day.
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With three hours remaining, Goddard's #35 Matt Stone Racing entry had logged 74 laps, the second-most for the day.
Anton De Pasquale completed 59 laps to 1500 AEST in his #100 Dick Johnson Racing Ford Mustang.
Teammate and fellow DJR recruit Will Davison logged 50 laps in the #17 entry.
Despite their heavy mileage, Jamie Whincup and Shane van Gisbergen remained fourth and fifth on the time sheets.
Team Sydney's two entries combined for 89 laps, with Fabian Coulthard and Garry Jacobson also joined on track by Jonathon Webb.
To the six hour mark, all eight cars were split by eight tenths of a second.
Testing at Ipswich will conclude at 1700 AEST.
Victorian teams will hit Winton Motor Raceway on Friday 19 February, with the test rescheduled amid the latest Victorian lockdown.
The 2021 Repco Supercars Championship will commence at the Repco Mt Panorama 500. Tickets are on sale now.