The Brazilian Grand Prix looks like being a straight fight between Rubens Barrichello and Mark Webber.

The chaotic qualifying session at the Brazilian Grand Prix, and the subsequent mixed-up grid, makes drawing definitive conclusions from the fuel-adjusted lap times difficult.

The drivers in the top 10 shoot-out are not allowed to refuel between qualifying and the race, so their pace is dictated by how much fuel they have on board.

And once the weight of fuel in the cars in the final session is taken into account, Red Bull's Webber emerges as the fastest man in the field, with pole-man Barrichello second, albeit by a margin of only 0.056 seconds.

Qualifying was held in the wet, and forecasts for the race are mixed. But it is still possible to draw a sense of who might be in best shape for the race.