The car has changed since Singapore, says Hamilton

Triple Formula One world champion Lewis Hamilton hinted on Sunday that a change of tire pressures may have contributed to the end of his qualifying dominance and team mate Nico Rosberg's late-season resurgence. "From Singapore onwards there's been a change to the car -- but whether or not that's made a difference, I don't know really," Hamilton told reporters after finishing second to Rosberg in Sunday's Brazilian Grand Prix.