Well the 15-21 wrx didn’t
Well the 15-21 wrx didn’t “require” 91 either. It “recommended” 91 same as the 22. So it’s not an upgrade….it’s the exact same. Additionally, it’s important people know how these cars recognize it’s running fuel with an octane lower than 91. The car knocks……then it pulls power, then knocks, then pulls power, then repeats this process until there’s no more knock. Shoddy research in this article.