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Why so lean? I've just done a bit of digging that suggests 0.75-0.85 lambda is ideal for E85. As we don't have it over here though I'm not sure. Have you just bumped the whole map up by the same amount??
If E85 is like petrol, you'll gain more by advancing the tune than you will by going leaner. Thats why its beneficial to see if making a tune richer will reduce knock before removing timing.
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