Excellent question! Hmm, Honda, Toyota, BMW, Audi and VW did actually ask for a more standardized gasoline with detergent exceeding federal requirements. Top Tier gasoline is the result of that. Will 93 octane contain more detergent? Maybe! But those car manufacturers have cars that run on regular and premium gas. So, would GDI (esp our Tellys) benefit from premium? Manual suggests "87 or higher". Are detergents present in all grades of gas? Yes. But how much detergent is enough? My son's first car is a 2014/15 Mazda 3. SKYACTIVE--It's another variation of "a little engine that could"--GDI. High compression (more HP), gas conserving (regular gas) and peppy acceleration! What more to ask? Almost 7 years old now but still an exciting car according to him when he last visited me this summer from Boston (400 miles away). Looks like Mazda has so far avoided the pitfalls of GDI (carbon deposit)! That's new technology for you! But when is the precipitous (or gradual?) drop in performance and mpg occur? Did Kia/Hyundai's Atkinson's cycle finally found the fountain of youth in their latest quest for supremacy? Ah, only time will tell (no pun intended)! Some say that 93 octane on cars requiring only 87 is like taking multivitamins--you pee it out whatever is excess (lol). As for me, I'll stick to 87! Maybe 93 from time to time ( since I only drive no more than 5k miles/year) will help overall in the longer haul (watch out those with addictive personalities--it may cost you $)! Thanks!Would 93 octane help with preventing the carbon build up, since it contains better detergents, additives?