Max Verstappen says it is "mentally not doable" for him to remain in Formula 1 if the series can't drastically improve its power unit regulations for 2027, with proposals to move to a 60-40 split between combustion power and electric energy now in jeopardy.<br>As F1 stakeholders try to find ways to improve the flawed 2026 power unit regulations for next year, a proposal has been tabled by the FIA ...<a class='more' href='https://www.autosport.com/f1/news/max-verstappen-reignites-quit-threats-amid-doubts-over-2027-f1-rule-changes/10823615/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-ALL&utm_term=News&utm_content=uk'>Keep reading</a>