I run 93 octane, but i'm not sure what the manual calls for. Using a higher octane than 93 is just wasting money because i'll bet the pioneer isn't tuned for anything above 93. It probably won't run E85 because of the simplisetic fuel injection system. I don't use stabil in any of my engines and i have yet to have an issue, guess i'm just lucky. As far as the pioneer goes i definitely don't see a need for fuel stabilizer as it is fuel injected.