Since early this year 2005, the regulations were set already where you can only use one set of tires for the entire race including 2 qualifyings and one race, even the fuel i think. Since last race or last last race, the regulations had been changed already, so now only one qualifying session.
Ferarri ah? no comment.. never like them... but I found out that cars using Bridgestone tires are not performing well this year, meaning, Bridgestone = cannot tahan long hour races. All teams had switched from using Bridgestone to Michellin. Only left 2 teams with Bridgestone and the 2 are not performing good either.
They do this to help the poor performing team to continue to be able to stay in the F1 races.. if not.. hahaha most of the poor teams sure bankrupt and no more teams joining the F1..thats why FIA wants to maintain them.. so use less tires (Which costs a lot!!!)