I have noticed the same idling benefit after filling up with premium a few days ago. Being a brand new car the idle on reg was pretty damn smooth most of the time, but I noticed occasional subtle hiccups that nudged the rpm somewhere between 1/16 to 1/8 of an rpm sitting around 3/4 of an rpm when idling. These past 4 days since filling up with 93, the idle has been perfectly smooth at all times, regardless of how long the red light is. I too don't drive a lot, about 10,000 miles per yr, and went through my first tank in 2 weeks, about 450 miles for me as I do a lot of city & rush hour hwy driving. Gas prices aren't as bad now as they can be, 93 was $4 per gallon, I am used to that being the 87 price (down to $3.50s now). It is worth it for me, even if the idling perfection is the only noticeable difference to me.Regardless of symantics, I swear it idles better and a rough idle at a stop light drives me crazy. Not saying everyone should run premium. It'll run just fine on regular, I ran 500 miles on it. But for those that see the value in it, it's something to consider. Remember it's just my humble opinion.