Polesitter Helio Castroneves underlined his status as the man to beat in the Indianapolis 500 by topping the traditional Carb Day practice session – the final chance for teams to fine-tune their setups prior to Sunday's race.
The Penske driver set his time of 40.1929 seconds on only his third lap and then remained unbeaten for the rest of the hour.
His teammate Will Power completed a Penske one-two as he prepared for what could be his last IndyCar Series race of the year, with Ryan Briscoe emphasizing Penske's pace in fifth place.
Mario Moraes impressed again in third place, and with his teammates Townsend Bell and Paul Tracy taking ninth and 12th, KV Racing Technology looks in extremely good shape going into its second Indy 500.
Dan Wheldon suggested he will rapidly move forward from his 18th place on the grid by going fourth quickest for Panther Racing today, with Ganassi duo Dario Franchitti and Scott Dixon, and fourth-place qualifier Graham Rahal (Newman/Haas/Lanigan) completing the top eight.
Davey Hamilton set a promising 10th-fastest time in the best of Dreyer & Reinbold's four entries - but it was an underwhelming session for race's only other four-car squad, Andretti Green Racing, as its top runner Tony Kanaan was back in 11th.
Pos Driver Team Time Gap
1. Helio Castroneves Penske 40.1929s
2. Will Power Penske 40.2577s + 0.0648s
3. Mario Moraes KV 40.3676s + 0.1747s
4. Dan Wheldon Panther 40.4701s + 0.2772s
5. Ryan Briscoe Penske 40.4724s + 0.2795s
6. Dario Franchitti Ganassi 40.4754s + 0.2825s
7. Scott Dixon Ganassi 40.5374s + 0.3445s
8. Graham Rahal Newman/Haas/Lanigan 40.5824s + 0.3895s
9. Townsend Bell KV 40.6441s + 0.4512s
10. Davey Hamilton Dreyer & Reinbold 40.6557s + 0.4628s
11. Tony Kanaan Andretti Green 40.7049s + 0.5120s
12. Paul Tracy KV 40.7278s + 0.5349s
13. Vitor Meira Foyt 40.7966s + 0.6037s
14. Raphael Matos Luczo Dragon 40.8445s + 0.6516s
15. Marco Andretti Andretti Green 40.8710s + 0.6781s
16. AJ Foyt IV Foyt 40.8870s + 0.6941s
17. Scott Sharp Panther 40.9133s + 0.7204s
18. Tomas Scheckter Coyne 40.9302s + 0.7373s
19. Alex Tagliani Conquest 40.9401s + 0.7472s
20. Hideki Mutoh Andretti Green 40.9786s + 0.7857s
21. Ed Carpenter Vision 40.9833s + 0.7904s
22. Mike Conway Dreyer & Reinbold 40.9910s + 0.7981s
23. Danica Patrick Andretti Green 41.0344s + 0.8415s
24. Oriol Servia Rahal Letterman 41.0364s + 0.8435s
25. Alex Lloyd Schmidt/Ganassi 41.0467s + 0.8538s
26. Justin Wilson Coyne 41.1111s + 0.9182s
27. Ryan Hunter-Reay Vision 41.1725s + 0.9796s
28. Robert Doornbos Newman/Haas/Lanigan 41.2534s + 1.0605s
29. EJ Viso HVM 41.3246s + 1.1317s
30. Milka Duno Dreyer & Reinbold 41.3604s + 1.1675s
31. Sarah Fisher Fisher 41.4145s + 1.2216s
32. John Andretti Dreyer & Reinbold/Petty 41.4181s + 1.2252s
33. Nelson Philippe HVM 41.5453s + 1.3524s