Nikolas Tombazis says Formula 1 cannot give drivers full control of energy deployment.

Tombazis said drivers could quickly exhaust their available energy if deployment were simply switched on and off manually. He added that battery limits also prevent an expensive development contest that could produce larger, heavier cars.

The FIA single-seater director expects greater combustion-engine use to simplify energy management. Formula 1 plans to adjust the current power balance toward a 60-40 split by 2028.