i have heard from some ppl in the fuel refining industry ?? , that standard 91RON fuel is crap quality . its got "bottom" of the fuel grade blended into it & is cheaply made without regard to quality of consistancy in fuel types blended into it ; i was told if you care for your bike or car always buy @ least 95 RON premium or better . you get what you pay for , i dont want to risk running crap standard 91RON fuel in my Harley " i paid to much $$ for my HD" to risk it only to save 10 to 14 cents more per litre , only to save $2.50 per fill up .
Don't know how it all equates to cars , but last week picked up a brand new ute, there was a bit off fuel in it , done 150-160 klm ,it ran like a new car should run , I filled it up with premium and it started idling rough , running rough , filled it up again this morning put in 95 and its back to running like a new car should . Am definetly gonna give my bike a go on 95 nstead of premium next fill.