So I know there are many topics about what fuel you should use but I haven’t found any that fully answers my question I live in Iceland and in the whole country there are maybe 10 98ron fuel stations and since I bought the car in march i only put 98ron in it but right away I didn’t like how it stuttered when I was stopped at light or when it was heating up it had really weird misfire no codes did show up I thought maybe bad batch of fuel so I filled up at another station and itremained the same changed my spark plugs ignition coils and camshaft magnets only for the idle to stay the same so I decided to fill up the car with 95ron and when I drove it for like an hour the idle smoothed out no stutters no anything I haven’t been booting the car only town driving at like 100km/h and now have went through 2 full tanks of 95ron and the car runs so much better the shifts are smoother it doesn’t vibrate like it’s about to die when I’m stopped at lights I heard it’s ok to run 95ron on stock cars but mine has been mapped to stage 1 I have tried all the fuel stations near me that sell 98ron but all run the same so should I stick tothe 95ron or go back to shitty quality 98ron