[tomm.brz]

Originally Posted by halujeddo

if you don’t have access to get 91 oct premium fuel, E15 or E30 would be perfect options, with proper tunes of course. it seems like you’re from states, you probably can find 91oct easily, so e15 or e30 seems unnecessary for you.

if i could find e15 or e30 from pump, i would never miss this.

Generally i add 5 liters of ethanol (not e85, 96% purity ethanol) to the best fuel i can find in my country. Making my own blend. With this formula, it becomes almost ron98, but still much worse than U.S. 91oct.

wait wait wait...i can add some liters of pure ethanol directly in my tank with normal gas and make my own ethanol blend safely?