Formula 1 faced fresh criticism after pre-season testing in Bahrain.
Max Verstappen and Lewis Hamilton both questioned the new regulations.
The rule overhaul introduced new engines, chassis, tyres and fully sustainable fuel.
Mercedes set the fastest times with Kimi Antonelli and George Russell.
Ferrari followed with Hamilton and Charles Leclerc.
McLaren placed fifth and sixth with Oscar Piastri and Lando Norris.
Verstappen finished seventh but showed strong straight-line speed for Red Bull.
Drivers spent most sessions learning complex energy management systems.
The new power units split output almost equally between combustion and electric power.
Verstappen called the result “not fun” and “the opposite of racing”.
He warned he could leave the sport if enjoyment disappears.
Hamilton said the technology is so complex fans may not understand it.
Norris rejected the criticism and said the cars remain enjoyable.
He insisted Verstappen would still fight to win.
Ferrari impressed with strong race simulations and further upgrades planned.
Mercedes boss Toto Wolff claimed a major pace advantage.
Red Bull denied this and accused Mercedes of hiding performance.
Political tension continues over an alleged Mercedes engine loophole.
The FIA wants a decision before Melbourne.
Further back, Aston Martin struggled with its first car designed by Adrian Newey.
Lance Stroll said the team lacks grip, balance and engine performance.
They remain several seconds off the leading pace.
