Lewis Hamilton claims that Formula 1 is "not delivering" on their promise to make the racing closer.
F1 adopted new cars in 2022 which were designed to reduce the amount of aerodynamic turbulence - or 'dirty air' - that gets produced in their wake.
But some drivers still claim that it is tough to follow, with Carlos Sainz and Lando Norris vocal about the problems.
Hamilton also believes it is still difficult to follow, but adds that it is easier with the current generation of cars.
"I think it's still a little bit better than the previous generation of cars, but hasn't delivered everything they said it would," he told media, including RacingNews365.com.
"So there are some improvements to make hopefully for the future."
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Mercedes struggled to follow more because of porpoising
Mercedes struggled with porpoising in 2022 more than other teams, which Hamilton believes was compounded by the issue with dirty air.
He added: "I think last year for us was pretty bad with the bouncing because you've got the turbulence and the bouncing.
"This year we don't have the bouncing, so we have less issues following cars."
The team is still searching for answers over its lack of performance compared to rivals Red Bull and Aston Martin, with plans to introduce upgrades in the upcoming races.