Does octane ratings matter? do different brands of gasoline make a difference? while i cant exactly prove how it does, I can tell you with certainty that Porsche's are better taken care of than Hyundai's. i see this all day long cheaper cars come with so much gunk i have to run them through the ultrasonic machine a few times, where higher end brands, the fuel injectors basically come clean most of the time. Just a regular blessing and they are good to go again. comment below what think. -Bryan