Ross Brawn, the team Principal of Mercedes Petronas has said that the reason why the Mercedes car is good in qualifying but not so good in the race is because of how it treats its tyres when the car is heavy with the full fuel load.  Nico Rosberg had expressed his surprise at not doing well in the race after having done well in qualifying.  Brawn’s answer is what we have seen above.  Brawn also cites the fact that once fuel loads were down, the car was able to go faster again, and this explains why Rosberg was able charge back up the field again towards the end after he kept going backwards rapidly in the early part of the race.  Mercedes will look for solutions for otherwise they are unlikely to win races.