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· Not a mod... or is he? Or, is he not?
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You might see a little less timing adjustment but I believe the fa20 engines are capable of using sub premium fuel so using premium fuel would only give a little advantage.
 

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You might see a little less timing adjustment but I believe the fa20 engines are capable of using sub premium fuel so using premium fuel would only give a little advantage.
Capable, sure.

With the sensitivity to knock that these engines have, the ECU jumps at each and every opportunity to pull timing... even with 93 R+M/2 US gas from what I've seen. In that case, there would be definite advantages to running the most det-resistant fuel available.

But seriously... what does the manual say? Follow Subaru's guidelines. It may be regionally dependent.
 
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