as i've said before, my car just says to use regular, but under load at times, it would ping/predetonate...i switched to premium maybe 2 years ago...hasn't done it once since...i would bet 99% of regular drivers wouldn't even know it happens, until they need to get the intake/fuel system flushed because of potential issues long term...my tank is only 43L, so it's usually only about $35 to fill, with the extra cost of premium likely only about $4/fill...considering the improved fuel economy and responsiveness, it's worth the slight upcharge...i use it in our Sorento as well, even though it never seemed to ping on regular.