Sebastian Vettel and Red Bull remained untouchable in Indian Grand Prix practice, the Formula 1 world champion leading team-mate Mark Webber in a shortened final session ahead of qualifying.
Vettel, quickest in both of Friday's sessions, needed just one lap on the softer tyres to elevate himself to first place with a time of 1m25.332s. He then focused on longer runs with the soft rubber, which he seemed to struggle on as the blistering issues continued.
The German driver did not even complete a run using the harder compound.
Webber finished second, but over 0.5 seconds behind his team-mate, with Ferrari's Fernando Alonso the first of the non-Red Bull drivers in third, albeit over seven tenths off Vettel.
Sauber's Nico Hulkenberg showed strong pace once more, the Sauber driver finishing in fourth ahead of Lotus's Romain Grosjean, who completed the top five.
The start of the session was initially delayed by 15 minutes because of visibility problems.
Race control announced a further 15-minute delay moments later, only to then shorten that to five minutes, with the session finally getting underway 20 minutes later than scheduled and the running restricted to 40 minutes.
The decision to shorten the session meant the action was frantic from the start, with most drivers taking to the track right away.
Webber was the initial pacesetter in the Red Bull before Felipe Massa and then team-mate Alonso moved to the top of the times, before the Australian driver regained the top spot moments later.
Twelve minutes in, it was McLaren's Sergio Perez who went quickest by just 0.044s as the top four were covered by less than a tenth of a second.
Alonso then regained first place before Vettel completed his first soft-tyre run with a time that was over 1.5s quicker than anybody else and also the best lap of the weekend so far, a 1m25.332s.
Webber also tried the soft tyres before the halfway point, but the Australian was over half a second off his team-mate's pace.
Red Bull, struggling with the degradation of the soft tyres this weekend, seemed to focus mainly on solutions to extend the life of the rubber.
Despite everyone trying the soft tyres as the session progress, no one could get close to Vettel's time.
The only significant incident of the session involved Hulkenberg hitting one of his Sauber mechanics when returning to the pits. The mechanic took a tumble but got up on his own and seemed to suffer no serious injuries.
Pos Driver Team Time Gap Laps
1. Sebastian Vettel Red Bull-Renault 1m25.332s 16
2. Mark Webber Red Bull-Renault 1m25.892s +0.560s 14
3. Fernando Alonso Ferrari 1m26.105s +0.773s 19
4. Nico Hulkenberg Sauber-Ferrari 1m26.306s +0.974s 17
5. Romain Grosjean Lotus-Renault 1m26.350s +1.018s 16
6. Felipe Massa Ferrari 1m26.435s +1.103s 20
7. Paul di Resta Force India-Mercedes 1m26.438s +1.106s 15
8. Nico Rosberg Mercedes 1m26.441s +1.109s 19
9. Jenson Button McLaren-Mercedes 1m26.489s +1.157s 15
10. Lewis Hamilton Mercedes 1m26.557s +1.225s 17
11. Kimi Raikkonen Lotus-Renault 1m26.635s +1.303s 14
12. Pastor Maldonado Williams-Renault 1m26.641s +1.309s 13
13. Sergio Perez McLaren-Mercedes 1m26.737s +1.405s 13
14. Adrian Sutil Force India-Mercedes 1m26.847s +1.515s 17
15. Jean-Eric Vergne Toro Rosso-Ferrari 1m26.876s +1.544s 17
16. Valtteri Bottas Williams-Renault 1m26.883s +1.551s 15
17. Daniel Ricciardo Toro Rosso-Ferrari 1m27.259s +1.927s 18
18. Charles Pic Caterham-Renault 1m27.941s +2.609s 18
19. Esteban Gutierrez Sauber-Ferrari 1m28.019s +2.687s 15
20. Giedo van der Garde Caterham-Renault 1m28.498s +3.166s 16
21. Max Chilton Marussia-Cosworth 1m29.094s +3.762s 11
22. Jules Bianchi Marussia-Cosworth 1m29.169s +3.837s 13