https://dirtfish.com/rally/wrc/why-m...gine-upgrades/

Apparently the FIA & promoter might tweak the fuel being used in the championship next year: "

DirtFish understands from sources close to the FIA that the fuel will be ‘tweaked’ for 2023, with that fuel delivered to the teams in time for winter testing after the 2022 season closes in Japan in November.

P1’s WRC fuel uses a mixture of sustainable elements. Bio-methanol produced from farm waste is supplied by Dutch fertilizer company OCI, while Aramco was tasked with developing biofuels and sustainable synthetic fuels derived from captured carbon dioxide and low-carbon hydrogen."