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Do This:
✔ Monitor ethanol content in real-time to prevent unexpected AFR shifts.
✔ Gradually increase ethanol content while logging fuel trims & knock values.
✔ Use staged fuel system upgrades if running E50+ to prevent lean conditions.
Avoid This:
❌ Running full E85 on stock DI fuel system.
❌ Using aggressive timing advance without knock feedback tuning.
❌ Ignoring fuel pressure drops when scaling ethanol content.