Mileages so far
Ferrari wears the reliability crown after the first two tests of 2011, with Fernando Alonso and Felipe Massa able to rack up notably more laps than any of their rivals during the weeks at Valencia and Jerez.
But reigning champion Red Bull is not far behind, while Mercedes and Williams have had mixed fortunes - a good amount of running for Michael Schumacher and Rubens Barrichello, but a lot more issues for Nico Rosberg and Pastor Maldonado.
Force India, Virgin, McLaren and Hispania's miles in 2010 cars are not counted, so the lists below show only what they have achieved in their 2011 machines.
Teams:
1. Ferrari - 1,981 miles
2. Red Bull - 1,727 miles
3. Mercedes - 1,437 miles
4. Williams - 1,340 miles
5. Renault - 1,323 miles
6. Toro Rosso - 1,316 miles
7. Sauber - 1,041 miles
8. Force India - 726 miles
9. Lotus - 673 miles
10. McLaren - 640 miles
11. Virgin - 594 miles
12. Hispania - 0 miles
Drivers:
1. Alonso - 1,186 miles
2. Schumacher - 932 miles
3. Barrichello - 874 miles
4. Webber - 872 miles
5. Vettel - 855 miles
6. Buemi - 796 miles
7. Massa - 795 miles
8. Perez- 778 miles
9. Kobayashi - 636 miles
10. Alguersuari - 520 miles
11. Rosberg - 505 miles
12. Kubica - 495 miles
13. Maldonado - 466 miles
14. Di Resta - 448 miles
15. Petrov - 405 miles
16. Button - 382 miles
17. Trulli - 350 miles
18. Kovalainen - 323 miles
19. D'Ambrosio - 322 miles
20. Sutil - 278 miles
21. Glock - 272 miles
22. Hamilton - 258 miles
23. Heidfeld - 236 miles
24. Senna - 187 miles
25. Ricciardo - 102 miles
Test one, Valencia
Just three days before suffering the horrendous injuries that could rule him out of all of the 2011 season, Renault's Robert Kubica set the fastest time of the opening week of winter action at Valencia.
Rival teams were generally impressed by the radical new Renault, and Kubica's 1m13.1s on the third and final day of the test confirmed the team was in good shape.
Ferrari could also go home happy, with Fernando Alonso a close second, while Red Bull was inevitably competitive too.
Mercedes seemed to be in trouble at this point, while Toro Rosso and Williams had problems to overcome.
Lotus joined the fray a day later than the rest, and then had a tough run of teething troubles to kick off.
McLaren, Force India, Hispania and Virgin ran 2010 cars at this test so are not counted in the table below.
Combined times from Valencia:
1 KUBICA Renault 1m13.144s
2 ALONSO Ferrari 1m13.307s
3 VETTEL Red Bull 1m13.614s
4 WEBBER Red Bull 1m13.936s
5 MASSA Ferrari 1m14.017s
6 MALDONADO Williams 1m14.299s
7 PEREZ Sauber 1m14.469s
8 SCHUMACHER Mercedes 1m14.537s
9 ROSBERG Mercedes 1m14.645s
10 BUEMI Toro Rosso 1m14.801s
11 KOBAYASHI Sauber 1m15.621s
12 BARRICHELLO Williams 1m16.023s
13 PETROV Renault 1m16.351s
14 ALGUERSUARI Toro Rosso 1m16.474s
15 KOVALAINEN Lotus 1m20.649s
16 TRULLI Lotus no time
Test two, Jerez
The second test at Jerez seemed a lot harder to read, with much wider divergence in programmes among the teams.
Williams and Mercedes in particular shot from the back to the front, with veterans Rubens Barrichello and Michael Schumacher ending the week in a one-two, but having seemingly set those times on relatively low fuel loads.
Renault tried out Nick Heidfeld as a potential Kubica stand-in and he also went on a spurt to lead the way on Saturday with the third-fastest time overall.
There was consistent pace from Ferrari, Toro Rosso and Sauber fared better, and the new McLaren looked quietly promising.
But Red Bull totally hid its potential, focusing on (impressively quick) long runs and avoiding getting into the fight at the front.
The week also saw Force India and Virgin's new cars make their debuts, and the gap between Virgin/Lotus and the older teams seemed to have closed considerably.
Hispania skipped the test to do filming work with Pirelli at Monza.
Jerez test combined times:
1 BARRICHELLO Williams 1m19.832s
2 SCHUMACHER Mercedes 1m20.352s
3 HEIDFELD Renault 1m20.361s
4 MASSA Ferrari 1m20.413s
5 ALONSO Ferrari 1m20.493s
6 KOBAYASHI Sauber 1m20.601s
7 BUTTON McLaren 1m21.009s
8 HAMILTON McLaren 1m21.099s
9 BUEMI Toro Rosso 1m21.213s
10 ALGUERSUARI Toro Rosso 1m21.214s
11 SENNA Renault 1m21.400s
12 PEREZ Sauber 1m21.483s
13 WEBBER Red Bull 1m21.522s
14 VETTEL Red Bull 1m21.574s
15 KOVALAINEN Lotus 1m21.632s
16 RICCIARDO Toro Rosso 1m21.755s
17 SUTIL Force India 1m21.780s
18 ROSBERG Mercedes 1m22.103s
19 GLOCK Virgin 1m22.208s
20 PETROV Renault 1m22.493s
21 MALDONADO Williams 1m22.591s
22 DI RESTA Force India 1m22.945s
23 D'AMBROSIO Virgin 1m22.985s
24 TRULLI Lotus 1m23.216s