Wondering what grade fuel owners are using.
I have never run anything but premium until the other day when by mistake
I filled the tank with regular. The car runs just fine on that grade of fuel. Suprise , suprise, I had visions of knocking, pinging and poor performance, actually I can' t tell the difference.

So what is my long range plan, who knows..

also depends on your climate, real warm areas are prone to knocking more than cooler areas. i would try middle grade first before jumping all the way down to regular.