Your Subaru can handle Super E10. An octane rating of 98 ROZ is recommended for full performance. E10 currently has an octane rating of 95 ROZ.

Your E10-check summary

Car Subaru
WRX STI Yes
This information is based on data provided by the car manufacturers (as of 06/2021) for the E10-compatability list of Deutsche Automobiltreuhand (DAT). It only applies to petrol-engined vehicles registered in the U.K. or an EU member state in series production condition or with original spare parts from the manufacturer. No statement can be made for imports from countries of origin outside the EU. The same applies to vehicles with retrofitted parking heaters

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