Sebastian Vettel not only topped the time sheets on the final day of the young driver test, he set the fastest time of the three days of running at Silverstone.
Red Bull's triple world champion took over from junior driver Carlos Sainz Jr in the afternoon session, putting in 78 laps in an effort to evaluate the new Pirelli tyres set to be used from the Hungarian Grand Prix onwards.
Silverstone was where several riders suffered high-speed blow-outs on the old tyres a few weeks earlier, but with the new tyres coming through this week's test at the same venue with no reported issues, the general consensus is that they are safe and reliable.
"For construction and safety it is better - and nothing has happened here," said Felipe Massa, who tested the tyres for Ferrari in the morning session on Friday.
"There were no blow-outs or punctures like we saw in this race. That is the most important thing."
Force India driver Adrian Sutil set the fastest time of the morning, which turned out to be good enough to end the day second fastest, three-and-a-half tenths slower than Vettel.
Lotus development driver Nicolas Prost was third fastest on the day, just ahead of Sainz.
Ferrari simulator driver Davide Rigon edged Felipe Massa, who had gone out first of the two, to set the fifth fastest time of the day, and Jean-Eric Vergne, riding for Toro Rosso, was seventh quickest.
McLaren's Gary Paffett, who completed only six laps in the morning due to an engine problem, ended up eighth fastest after getting more work done in the afternoon.
Suzie Wolff, making her full F1 test debut for Williams, was ninth fastest, just ahead of Giedo van der Garde for Caterham.
Daniil Kvyat, making his debut for Toro Rosso, followed in 11th place ahead of Charles Pic, who took over for van der Garde in the afternoon.
Sauber debutant Kimya Sato was 13th fastest ahead of Marussia's Rodolfo Gonzalez, whose running was curtailed in the morning.
James Calado managed only five laps for Force India following Sutil's ride, and finished 15th fastest.
Marussia's Jules Bianchi finished 16th and last, but the Frenchman also had an early end to his day when he went off between Maggotts and Becketts as a result of a mechanical problem in the right-rear corner of the car.
1. Sebastian Vettel (Red Bull) 1m32.894s
2. Adrian Sutil (Force India-Mercedes) 1m33.242s
3. Nicolas Prost (Lotus-Renault) 1m33.256s
4. Carlos Sainz Jr (Red Bull-Renault) 1m33.546s
5. Davide Rigon (Ferrari) 1m33.592s
6. Felipe Massa (Ferrari) 1m33.624s
7. Jean-Eric Vergne (Toro Rosso-Ferrari) 1m33.647s
8. Gary Paffett (McLaren-Mercedes) 1m34.294s
9. Susie Wolff (Williams-Renault) 1m35.093s
10. Giedo van der Garde (Caterham-Renault) 1m35.155s
11. Daniil Kvyat (Toro Rosso-Ferrari) 1m35.281s
12. Charles Pic (Caterham-Renault) 1m35.576s
13. Kimiya Sato (Sauber-Ferrari) 1m35.642s
14. Rodolfo Gonzalez (Marussia-Cosworth) 1m36.339s
15. James Calado (Force India-Mercedes) 1m36.451s
16. Jules Bianchi (Marussia-Cosworth) 1m36.744s
Final Day's Action At Silverstone