Kimi Raikkonen spearheaded a Ferrari one-two at the end of 2016 pre-season Formula 1 testing, but it was Mercedes that emerged literally miles ahead of its rivals on lap count.
After Vettel led the way at the end of the first test, Raikkonen responded to top the overall timesheet come the conclusion to the second at Barcelona's Catalunya track.
Like Vettel in test one, Raikkonen's leading time this week was set on the new-for-2016 ultra-soft compound, which he used to lap in 1m22.765s on day three.
More eye-catching, however, was Vettel using super-softs for his best lap on the final day. The four-time champion finished just 0.087 seconds behind Raikkonen in the week's overall times, and was comfortably faster than anyone else had been on that compound.
Pirelli estimates there is a 0.5s-0.6s performance gap between the types of rubber, highlighting the impressive nature of Vettel's run.
But Ferrari will no doubt be anxiously curious as to the true pace of its main rival Mercedes, which at barely any stage showed its hand - barring a blast on a set of soft tyres from Nico Rosberg on day one.
Rosberg's lap of 1m23.022s was ultimately just 0.257s adrift of Raikkonen, and 0.170s behind Vettel, with Pirelli suggesting a time difference of 0.5s between the super-soft and soft tyres.
But when it comes to reliability, Mercedes was head and shoulders clear of not only Ferrari, but every other team.
To add to the 675 laps from test one, Mercedes amassed a further 619 in test two, amounting to 1790 miles this week, and 3742 over the eight days - the equivalent of 19.6 Spanish Grands Prix.
Toro Rosso was Mercedes' closest rival on that front, clocking up 602 laps, for 3034 miles over the eight days, while Ferrari's grand total proved to be 2470 miles, a considerable 1302 miles less than Mercedes.
Rosberg emerged as the lap leader from the second test with 324, and overall with 656, pipping Hamilton by just 18.
Toro Rosso, running with a 2015 Ferrari power unit this season, has every reason to be proud of its performance the past four days as Max Verstappen and Carlos Sainz Jr completed 303 and 299 laps respectively.
At the other end of the scale, Esteban Gutierrez managed just 49 as Haas endured a torrid week due to reliability issues, in stark contrast to its solid running in the first test.
McLaren and power unit supplier Honda showed they have moved on from last year's disastrous test sessions that were the forerunner to one of the worst seasons in the Woking team's history.
Over eight days at Barcelona in 2015, McLaren managed a paltry 301 laps, but fast forward 12 months and the Anglo-Japanese alliance achieved 710, with 453 in test two alone.
In terms of driver contrasts, there were none greater than at Renault as Kevin Magnussen enjoyed a trouble-free four days to accumulate 509 laps, whereas Jolyon Palmer was plagued by gremlins and totalled only 267.
COMBINED TEST TWO STATS:
Combined best times of week two: Pos Driver Car Time Gap Tyres 1. Kimi Raikkonen Ferrari 1m22.765s US 2. Sebastian Vettel Ferrari 1m22.852s +0.087s SS 3. Nico Rosberg Mercedes 1m23.022s +0.257s S 4. Carlos Sainz Jr Toro Rosso-Ferrari 1m23.134s +0.369s US 5. Felipe Massa Williams-Mercedes 1m23.193s +0.428s S 6. Valtteri Bottas Williams-Mercedes 1m23.229s +0.464s US 7. Nico Hulkenberg Force India-Mercedes 1m23.251s +0.486s US 8. Max Verstappen Toro Rosso-Ferrari 1m23.382s +0.617s US 9. Lewis Hamilton Mercedes 1m23.622s +0.857s S 10. Sergio Perez Force India-Mercedes 1m23.721s +0.956s SS 11. Kevin Magnussen Renault 1m23.933s +1.168s SS 12. Daniel Ricciardo Red Bull-TAG 1m24.427s +1.662s S 13. Jenson Button McLaren-Honda 1m24.714s +1.949s US 14. Fernando Alonso McLaren-Honda 1m24.735s +1.970s S 15. Felipe Nasr Sauber-Ferrari 1m24.760s +1.995s S 16. Jolyon Palmer Renault 1m24.859s +2.094s SS 17. Pascal Wehrlein Manor-Mercedes 1m24.913s +2.148s US 18. Marcus Ericsson Sauber-Ferrari 1m25.031s +2.266s S 19. Daniil Kvyat Red Bull-TAG 1m25.049s +2.284s S 20. Romain Grosjean Haas-Ferrari 1m25.255s +2.490s S 21. Esteban Gutierrez Haas-Ferrari 1m25.422s +2.657s SS 22. Rio Haryanto Manor-Mercedes 1m25.899s +3.134s US Total week two mileage per driver: 1. Nico Rosberg 937 2. Max Verstappen 876 3. Carlos Sainz Jr 865 4. Lewis Hamilton 853 5. Sebastian Vettel 847 6. Daniel Ricciardo 746 7. Nico Hulkenberg 746 8. Felipe Massa 717 9. Kevin Magnussen 709 10. Jenson Button 700 11. Valtteri Bottas 668 12. Felipe Nasr 633 13. Fernando Alonso 610 14. Kimi Raikkonen 602 15. Daniil Kvyat 550 16. Sergio Perez 544 17. Jolyon Palmer 544 18. Marcus Ericsson 541 19. Romain Grosjean 417 20. Pascal Wehrlein 367 21. Rio Haryanto 298 22. Esteban Gutierrez 142 Total week two mileage by team: 1. Mercedes 1790 2. Toro Rosso 1741 3. Ferrari 1449 4. Williams 1385 5. McLaren 1310 6. Red Bull 1296 7. Force India 1290 8. Renault 1252 9. Sauber 1174 10. Manor 665 11. Haas 558 Total week two mileage by engine: 1. Mercedes 5131 2. Ferrari 2016 3182 3. Renault/TAG 2548 4. Ferrari 2015 1741 5. Honda 1310
COMBINED OVERALL WINTER TESTING STATS
Combined fastest times of winter testing: Pos Driver Car Time Gap Tyres 1. Kimi Raikkonen Ferrari 1m22.765s US 2. Sebastian Vettel Ferrari 1m22.810s +0.045s US 3. Nico Rosberg Mercedes 1m23.022s +0.257s S 4. Nico Hulkenberg Force India-Mercedes 1m23.110s +0.345s SS 5. Carlos Sainz Jr Toro Rosso-Ferrari 1m23.134s +0.369s US 6. Felipe Massa Williams-Mercedes 1m23.193s +0.428s S 7. Valtteri Bottas Williams-Mercedes 1m23.229s +0.464s SS 8. Max Verstappen Toro Rosso-Ferrari 1m23.382s +0.617s US 9. Daniel Ricciardo Red Bull-TAG 1m23.525s +0.760s US 10. Lewis Hamilton Mercedes 1m23.622s +0.857s S 11. Sergio Perez Force India-Mercedes 1m23.650s +0.885s SS 12. Kevin Magnussen Renault 1m23.933s +1.168s SS 13. Daniil Kvyat Red Bull-TAG 1m24.293s +1.528s US 14. Jenson Button McLaren-Honda 1m24.714s +1.949s US 15. Fernando Alonso McLaren-Honda 1m24.735s +1.970s S 16. Felipe Nasr Sauber-Ferrari 1m24.760s +1.995s S 17. Alfonso Celis Jr Force India-Mercedes 1m24.840s +2.075s SS 18. Jolyon Palmer Renault 1m24.859s +2.094s SS 19. Pascal Wehrlein Manor-Mercedes 1m24.913s +2.148s US 20. Marcus Ericsson Sauber-Ferrari 1m25.031s +2.266s S 21. Romain Grosjean Haas-Ferrari 1m25.255s +2.490s S 22. Esteban Gutierrez Haas-Ferrari 1m25.422s +2.657s SS 23. Rio Haryanto Manor-Mercedes 1m25.899s +3.134s US Total winter testing mileage by driver: 1. Nico Rosberg 1897 2. Lewis Hamilton 1845 3. Max Verstappen 1545 4. Carlos Sainz Jr 1490 5. Kevin Magnussen 1472 6. Sebastian Vettel 1412 7. Daniel Ricciardo 1322 8. Felipe Nasr 1316 9. Valtteri Bottas 1287 10. Felipe Massa 1189 11. Marcus Ericsson 1108 12. Jenson Button 1090 13. Kimi Raikkonen 1059 14. Daniil Kvyat 1041 15. Nico Hulkenberg 1033 16. Fernando Alonso 963 17. Sergio Perez 836 18. Jolyon Palmer 772 19. Romain Grosjean 743 20. Pascal Wehrlein 729 21. Rio Haryanto 671 22. Esteban Gutierrez 628 23. Alfonso Celis Jr 385 Total winter testing mileage by team: 1. Mercedes 3743 2. Toro Rosso 3034 3. Williams 2476 4. Ferrari 2470 5. Sauber total 2424* 6. Red Bull 2363 7. Force India 2253 8. Renault 2245 9. McLaren 2054 10. Manor 1400 11. Haas 1371 12. Sauber 2016 1174* * Sauber only ran its 2016 car in week two Total winter testing mileage by engine: 1. Mercedes 9872 2. Ferrari 2016 5016 3. Renault/TAG 4608 4. Ferrari 2015 4284 5. Honda 2054