Pre Race Weights for the Race.

[raindancer]

Below is the provisional grid for the Brazilian Grand Prix with each car's weight. Note - Force India’s Vitantonio Liuzzi is to get a new gearbox and will hence drop from his original P15 to P20.

1. Rubens Barrichello, Brawn GP, 650.5kg
2. Mark Webber, Red Bull, 656
3. Adrian Sutil, Force India, 656.5
4. Jarno Trulli, Toyota, 658.5
5. Kimi Raikkonen, Ferrari, 651.5
6. Sebastien Buemi, Toro Rosso, 659
7. Nico Rosberg, Williams, 657
8. Robert Kubica, BMW Sauber, 656
9. Kazuki Nakajima, Williams, 664
10. Fernando Alonso, Renault, 652
11. Kamui Kobayashi, Toyota, 671.6
12. Jaime Alguersuari, Toro Rosso, 671.5
13. Romain Grosjean, Renault, 677.2
14. Jenson Button, Brawn GP, 672
15. Sebastian Vettel, Red Bull, 683.5
16. Heikki Kovalainen, McLaren, 656.5
17. Lewis Hamilton, McLaren, 661
18. Nick Heidfeld, BMW Sauber, 650.5
19. Giancarlo Fisichella, Ferrari, 683.5
20. Vitantonio Liuzzi, Force India, 680

Barrichello and Nick lightest on the Grid with Fisi and Vettel heavier. If you see the top three Sutil is better placed slightly but Trulli is also in a good position.
Will Barrichello drive away or can the others catch him. A lot will depend on the conditions but assuming that to be a constant wondering how it will pan out.