The Italian cars have dominated F1 over a single lap for two months, their pace founded on their prodigious straight-line speed, and a car upgrade at the Singapore Grand Prix that gave them more downforce.
But on Saturday morning governing body the FIA issued a technical ruling underlining that it would be considered illegal for any team to tamper with the operation of the meter restricting fuel flow. This came as a response to an inquiry from Red Bull, in the context of Ferrari's advantage, into certain potential methods of increasing the fuel flow.