Only STI must use 98 RON fuel all the time, WRX is fine on 95, well a completely standard one is anyway.
You should stick to one or the other though, as the ECM will learn and add timing for 98. You might get a bit of ping now and then, even if you cant hear it.
I still think you need to get it scanned and make sure theres no codes.
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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i
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