Mercedes' engineers are still struggling to understand how Lewis Hamilton was able to set the fastest lap of the British Grand Prix on a set of tyres that should have been well past their best.
A new rule this year awards a bonus point to the driver who sets the fastest lap of the race and it has seen teams adapt their strategy and approach to the end of races in pursuit of the point.
The easiest way to secure the point is to fit fresh tyres towards the end of the race to have a mixture of fast rubber and low fuel in the closing stages.