N55 - e85+93 OR race gas OR race gas+93
Hi all. Looking to change my fuel to get a higher octane and slightly better performance, and am ignorant to the best way to achieve this. I have an N55 335xi with JB4 (no flex fuel wires and no other mods). Would it be best for me to run a 20% e85 mix with 93 octane fuel, mix race gas with 93 octane, or just put 100% race gas in? I would plan to drive this way most of the time, so it wouldn't just be for "track use".