"By the time drivers got onto fresh tyres in Practice 2 on Friday, they were very close to being back to the pace they were in October.
"By the time they got to Friday afternoon, they were in the high 2:04s.
"I was a bit surprised by the intense pace; Cam Waters said to me, with a joke and a smile, that, ‘We normally get a year to build up to this’.
"I thought that was quite pertinent; we normally have a run and jump before they have to go over the high bar.
"It’s so fantastically competitive. The level of driving and engineering is at such a high level. It probably shouldn’t come as a surprise that everyone was on the pace."
Scott McLaughlin still holds bragging rights for the fastest lap in the Supercar around the mountain, having set a 2:03.4813s lap in Practice 5 in 2019.
Last year, Waters clinched pole for the Great Race with a 2:03.5592s lap, which was 0.0779s down on McLaughlin's 2019 lap.
Warm conditions set in across the weekend, with the quickest race lap of the weekend coming on Saturday.
The 2:06.3483s set by Chaz Mostert, on lap 33 in Race 1, was just over seven tenths of a second down on Shane van Gisbergen's quickest race lap from last October's Bathurst 1000.
Van Gisbergen set his quickest lap in the 2020 Great Race on the penultimate lap of the 161-lap classic.
The Repco Supercars Championship field will return to Victoria for the Penrite Oil Sandown SuperSprint across March 20-21. Tickets are on sale now.