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I probably should have been more clear about where I see the leaner AFR. If I take the car out and get it fully warmed up, my idle with pure gas will be in the 13.6 to 13.8 range. At cruising speed my AFR will typically be in the 13.8 to maybe 14 range with pure gas. When I fill up with a blended fuel I can see the difference in idle AFR as well as my AFR at cruise. I initially set my base idle mixture (running ethanol fuel) so it would be at 14 to 14.2.
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Nick
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