Car Weights - Shanghai China

As we all know the car weights give a good indication as to the fuel loads carried by the teams, the weights have been announced as follows:

Sebastian Vettel 644 KG's - 15 laps
Fernando Alonso 637 KG's - 13 laps
Mark Webber 646.5 KG's - 16 laps
Rubens Barrichello 661 KG's - 21 laps
Jenson Button 659 KG's - 20 laps
Jarno Trulli 664.5 KG's - 22 laps
Nico Rosberg 650.5 KG's - 17 laps
Kimi Raikkonen 673.5 KG's - 26 laps
Lewis Hamilton 679 KG's - 28 laps
Sebastian Buemi 673 KG's - 26 laps
Nick Heidfeld 679 KG's - 28 laps
Heikki Kovalenien 697 KG's - 34 laps
Filipe Massa 690KG's - 31 laps
Timo Glock 652 KG's - 18 laps
Kazuki Nakajima 682.7 KG's -29 laps
Sebastian Bourdais 690 KG's -31 laps
Nelsihno Piquet 697.9 KG's - 34 laps
Robert Kubica 659 KG's - 20 laps
Adrian Sutil 648 KG's - 16 laps
Fishichella 679.5 KG's - 27 laps

I have guestimated at a 2.8KG per lap fuel usage (then rounded up) as a guide to how far into the race they will go