Welcome, JamesS, sorry I did not see your previous posts.
Just in case, what I think is that you can estimate the amount of fuel on board looking at the difference in lap times between the 2nd qualy, that I presume is ran with empty tanks, and the 3rd qualy, that I'm sure has to be ran with race fuel. I repost the numbers, with the proper headings.
Grid Name Team 3rd Q 2nd Q Diff.
8 Trulli Toyota 01:17.2 01:15.6 1.605
9 Webber RedBull 01:17.3 01:15.8 1.548
6 Rosberg Will. 01:16.5 01:15.3 1.261
7 Alonso Renault 01:16.9 01:15.8 1.025
4 Koval. McLaren 01:16.2 01:15.4 0.776
5 Kubica BMW 01:16.2 01:15.5 0.688
1 Massa Ferrari 01:15.8 01:15.1 0.677
3 Hamilt. McLaren 01:15.8 01:15.3 0.517
2 Räikk. Ferrari 01:15.8 01:15.4 0.411
I assume that the amount of fuel corresponds roughly with the order of the list, or the difference in time between both qualies.
That is, Trulli has a lot of fuel, Räikkönnen has the least.
Am I wrong about the idea that they fill the cars in the 3rd qualy?
I have too much work to make some statistics about pit laps and qualy differences. It would be interesting to deduce any correlation, if it exists at all.
Has anyone thought about this? And if what I'm saying is true, why not? It only dawned on me when I saw a post by grunf77 at Grand Prix.