But, you are getting something extra out of it. Most Top Tier brands add extra detergents to their premium line (I know Chevron put twice as much Techron into Super as they did the regular and mid-grade). Same principle with the Nitro+ additives in the Shell line. So, it's not JUST about the octane rating. Now, does the engine/manufacturer require that? Of course not. But, I'm okay paying for it knowing I'm getting those extra additives AND knowing my ECU isn't going crazy adjusting everything to match which ever grade (octane rating) gasoline I decided to buy that week.Premium will never hurt, but it is a waste of money if you dont get anything extra out of it.