Why’s one better than the other? Also, my car 2016 328i x drive was given to me at 61,000 miles. Is there anything I can buy to put in my gas tank with the gas once in a while just to clean out the gas lines? I know they sell stuff like that why or why should I use it? If I should which brand is best? Thanks in advance everyone!
The recommendation on my gas cap (2015 320i) says 90 or higher and no more than 10% ethanol. Not sure if that’s the recommendation across the board. I have a station near me that offers 92 octane premium with “up to 10% ethanol” that is $0.40 cheaper than the 91 with 0% ethanol.