Hanson lapped the 3.56-mile road course in 1m35.216s in his GTP class JDC-Miller MotorSports Porsche 963 in perfect track conditions for this one-hour session.
Brendon Hartley was quickest out of the blocks, the ex-F1 driver and three-time Le Mans winner setting a benchmark of 1m36.197s in the #10 Wayne Taylor Racing Acura ARX-06 in the early minutes of the session.
He was soon topped by Connor De Phillippi’s #25 RLL-run BMW M Hybrid V8 with a lap of 1m35.468s, which was 0.038s quicker than Tom Blomqvist in Action Express Racing’s Cadillac V-Series.R managed around the same time.
Neel Jani then took over at the top of the times with a 1m35.329s in Proton Competition’s Porsche 963, set during a short run that was likely a qualifying simulation ahead of tomorrow.
Quick times continued thick and fast after the halfway point, with De Phillippi improving to 1m35.399s, 0.070s away from Jani, and then matched his time to the thousandth of a second at 1m35.329s.
But Hanson unleashed the fastest time of the Roar so far with 20 minutes to go in JDC-Miller’s 963, his 1m35.216s pipping Pipo Derani’s best time from Friday in the AXR Caddy by 0.001s.
Sebastien Bourdais was fourth quickest in Chip Ganassi Racing’s Cadillac V-Series.R, ahead of Blomqvist.
Augusto Farfus was sixth in the second BMW from Hartley, Felipe Nasr (Penske Porsche), Jenson Button (WTR Acura) and Kevin Estre (Penske Porsche).
Source: Autosport