As ever with pre-season testing, reading too much into the timesheets - particularly after just four days of running at Jerez - can often be misleading, as differing objectives and priorities blur the picture of which teams have hit the ground running in 2015.
But while there is still an awful lot to learn, a close inspection of the data from the first four days of the new season does make for interesting reading...
This week’s unofficial aggregate test times from Jerez:
1. Kimi Raikkonen, Ferrari, 1m 20.841s, 200 laps
2. Sebastian Vettel, Ferrari, 1m 20.984s, 149 laps
3. Felipe Nasr, Sauber, 1m 21.545s, 197 laps
4. Nico Rosberg, Mercedes, 1m 21.982s, 308 laps
5. Marcus Ericsson, Sauber, 1m 22.019s, 185 laps
6. Lewis Hamilton, Mercedes, 1m 22.172s, 208 laps
7. Felipe Massa, Williams, 1m 22.276s, 144 laps
8. Valtteri Bottas, Williams, 1m 22.319s, 134 laps
9. Max Verstappen, Toro Rosso, 1m 22.553s, 170 laps
10. Pastor Maldonado, Lotus, 1m 22.713s, 137 laps
11. Carlos Sainz Jr, Toro Rosso, 1m 23.187s, 183 laps
12. Daniel Ricciardo, Red Bull, 1m 23.338s, 84 laps
13. Romain Grosjean, Lotus, 1m 23.802s, 53 laps
14. Daniil Kvyat, Red Bull, 1m 23.975s, 82 laps
15. Jenson Button, McLaren, 1m 27.660s, 41 laps
16. Fernando Alonso, McLaren, 1m 35.553s, 38 laps
Total distance run - by team (power unit, where different):
1. Mercedes, 516 laps - 2,284km
2. Sauber (Ferrari), 382 laps - 1,691km
3. Toro Rosso (Renault), 353 laps - 1,563km
4. Ferrari, 349 laps - 1,545km
5. Williams (Mercedes), 278 laps - 1,230km
6. Lotus (Mercedes), 190 laps - 841km
7. Red Bull (Renault), 166 laps - 735km
8. McLaren (Honda), 79 laps - 349km
Total distance run - by power unit:
1. Mercedes, 984 laps - 4,357km (3 teams)
2. Ferrari, 731 laps - 3,236km (2 teams)
3. Renault, 519 laps - 2,298km (2 teams)
4. Honda, 79 laps - 349km (1 team)
Longest stints - by tyre compound:
Soft compound - 19 laps (Pastor Maldonado, Day 3)
Medium compound - 29 laps (Nico Rosberg, Day 1)
Winter Hard compound - 34 laps (Nico Rosberg, Day 1)
Hard compound - 42 laps (Nico Rosberg, Day 1)
Intermediate compound - 25 laps (Nico Rosberg, Day 3)
Wet compound - 4 laps (Felipe Nasr, Day 2)
Jerez test comparison - Year on Year
2014 - 1,470 total laps (6,509 kilometres) completed in four days
2015 - 2,294 total laps (10,156 kilometres) completed in four days
That's a 56 percent increase
2014 fastest overall time - 1m 23.276s (Kevin Magnussen)
2015 fastest overall time - 1m20.841s (Kimi Raikkonen)
That's 2.9 percent faster
(source: f1.com)
