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Try using a water injection system with your lean burn. I've been doing some research and found that it can replace approx 10-12% of the fuel and may also allow you to push lean burn leaner. An added bonus is that it should reduce NOx emissions as well.
If your looking a the typical honda lean burn engine math says you'll want about 16cc/min of water injection, and it will have to be triggered by lean burn engaging via a relay or something. It's my lastest brainstorm to try and get more out of the lean burn setup.
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