My 2011 Hyundai Sonata specifies either using Top Tier fuel all the time or putting in a bottle of approved fuel additive at every oil change, so apparently the engineers at Hyundai think it’s good for something. Curious to know if anyone else out there owns a direct-injection engine and, if so, whether there is a similar advisement in that person’s owner’s manual. BTW, when I did the math, it was pretty much a wash between using expensive top-tier fuel at every fill versus using a bottle of Techron at every oil change.
Scrabbler