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Currently, F1 uses E10, with the ethanol made from non-food sources. 


The target for the 2026 rules package is 100% sustainable fuel.  The actual composition is unclear at this point.  It might be fuel created using the Porsche-Exxon direct CO2 capture process, or another alternative process from Aramco.


F1 has used some pretty exotic brews in the past.  The dominant Honda turbo V6 of the 1980s used a fuel composed of 84% toluene and 16% heptane.


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