I can tell a difference in the Rover between octane ratings, I've recently started noticing differences in where I buy my premium fuel also, I stopped buying it at the big box stores. I also notice in ALL my vehicles when I leave the valley where I live in and travel near Portland Oregon for instance, I always notice a difference in fuel mileage (better) and power (more) when I buy my fuel out of town. I've been told, or heard more than once that we are at the "end of the line" when it comes to fuel delivery in the valley I live in... Does anyone else have this phenomenon?? lol

 

Okay so about half a tank into the 93 octane the light has kicked off. Hopefully it stays off haha