Hitech's Deagen Fairclough topped the times as GB3 testing at Silverstone as preparations for this weekend's race event came to a close.
The British driver posted a 1m50.139s in the second of the day's three sessions, a lap quicker than the race one pole time earlier this year.
He was just 0.071s clear of Rodin's Abbi Pulling, who topped the final session of the day, with that lap being her best of the day.
Xcel Motorsport's Thursday pace-setter Lucas Fluxa was third quickest courtesy of his session two lap, and only 0.010s away from Pulling, with the top three covered by less than a tenth of a second as the field compressed.
Fluxa's teammate Rowan Campbell-Pilling completed a strong two days of testing with the fourth fastest time, with the Brit just two thousandths of a second clear of VRD's championship leader Nikita Bedrin.
Rodin Motorsport's Maxim Rehm was sixth and the final driver inside the top-10 to register their best lap in the final session.
Session one pace setter Patricio Gonzalez was seventh for VRD Racing, with his session two lap being an improvement on his earlier time, and 0.003s ahead of Rodin's Martin Molnar.
Flynn Jackes (Elite) and Jacob Micallef (Hitech) completed the top-10, which was covered by 0.595s. Elite's newcomer Edu Robinson posted the same lap time as Micallef in 11th, with the top-17 cars within a second of the outright pace.
The GB3 field returns to action with qualifying tomorrow at 09.35.
GB3 Championship, partnered by the BRDC, Silverstone Friday testing combined result:
1. Deagen Fairclough, Hitech, 1m50.139s
2. Abbi Pulling, Rodin Motorsport, +0.071s
3. Lucas Fluxa, Xcel Motorsport, +0.081s
4. Rowan Campbell-Pilling, Xcel Motorsport, +0.215s
5. Nikita Bedrin, VRD Racing, +0.217s
6. Maxim Rehm Rodin Motorsport, +0.416s
7. Patricio Gonzalez, VRD Racing, +0.419s
8. Martin Molnar, Rodin Motorsport, +0.492s
9. Flynn Jackes, Elite Motorsport, +0.585s
10. Jacob Micallef, Hitech, +0.595s
11. Edu Robinson, Elite Motorsport, +0.595s
12. Aurelia Nobels, Hillspeed, +0.685s
13. Rodrigo Gonzalez, VRD Racing, +0.746s
14. Leon Wilson, Arden Motorsport, +0.773s
15. Ricardo Baptista, Xcel Motorsport, +0.882s
16. Kyuho Lee, Elite Motorsport, +0.904s
17. Jack Taylor, Fortec Motorsports, +0.926s
18. Peter Bouzinelos, Hillspeed, +1.153s
19. Dante Vinci, Hillspeed, +1.154s
20. Yuhao Fu, Hitech, +1.501s
21. Jason Pribyl, Nitrous Competitions ADM Racing, +1.695s
22. Nadeem Rustombi, VRD Racing, +2.647s*
*Testing, not racing this weekend